sometimes I suck other times am good why is that?

I mean sometimes I play really good other times I really suck also on my phone I always suck on my pc I am good any one like me

Do you think sucking is bad?

It could be because of many things...

It could be that you focus extra/less in some matches.

or maybe you play solid chess but depend a bit too much on the opponent making a mistake?

or maybe it is just that you play someone better/worse than you half of the time?

(If both play badly the match can still be great though, lol.)

I'm the same. A lot depends on someone's mood, whether they're tired or not, whether they feel motivated or not. My chess really sucks today for example but then I was out last night till 1.30am and was proper hungover earlier on today :-P

     Its the same with drums. Some days I can do no wrong. Other times I can't hold the sticks.    Its the ying & yang of life.

I sadly haven't played the drums in over 5 years but i really remember "those" days *shudder*, others did best not to come close or they'd risk to feel the wrath of le drumsticks of doom >.<

Another thing to consider is that players below around 1700 are far better at attacking than defending so your play can look terrible just by playing your normal game if you succumb to a strong attack.

My performance fluctuates wildly. Some days I beat far higher rated players and other times I lose so embarrassingly it is shameful.
All I can put it down to is that sometimes you just aren't in the right frame of mind to win. Taking a break from playing and analysing the games you lost can give you ideas about where you went wrong, although I only really play for fun. I don't want to get into reading books about it or anything. But nobody likes losing all the time, so I just take a break and come back later.

Welcome to the game of "chess" where humans are inconsistent just like reality it-self. No-body is perfect but there are other things you can perfect ,and, that is, patient and determination to get better.

I though I was alone with this problem.  Your answers make me feel better about myself.

Dude, why are you thinking you should be like a pendulum that swings in only one direction? Do you think the Yin-Yang and the nature of polarity and duality that exists in the world just exists in the context of some things?  So much in the big picture seems to be a zero sum game... advantages always seem to be fleeting in the long run. The nature of life is, you win some, you lose some. 

Some people seem to be spinning faster than others, their sin waves have shorter periods. Doesn't mean they aren't having their ups an downs. Some people have higher amplitudes.  To people who are vascillating faster it can seem like someone who is operating at a different frequency or magnitude really has it made, but it may not be the case.

In fact, if the frequency (one's vibration) gets high enough, there may be some orthogonal opportunity in harmonics or resonance.

". . . 

   So sometimes things are ahead and sometimes they are behind;
   Sometimes breathing is hard, sometimes it comes easily;
   Sometimes there is strength and sometimes weakness;
   Sometimes one is up and sometimes down.

   Therefore the sage avoids extremes, excesses, and complacency."

-Lao Tzu (Tao Te Ching)

How tired I am is the biggest difference in my game. Prime example, I was on vacation when I opened this account, lots of free time and no distractions and I played good and got to 1850.... then I went back to work and it turns out after working 12 hrs I don't play so good but online ratings really mean nothing to me so who cares lol.

My ELO swings a lot. In a really bad week I can compulsively play myself down below 1100, and on a really good week I can hit 1300 in 5 minute blitz.  The other day I was playing upper 1200's now I'm below 1200's.  That's life. Some people may carefully orchestrate their playing and ELO to only play at the top of their game.  But then their ELO doesn't really reflect their hour-to-hour day-to-day reality, so their standing and appearance of constistent strength is a bit of an illusion.

Some people are more unflappable. They are more steady and consistent. Doesn't mean they achieve the moments of brilliance someone with magnified viscissitudes experiences periodically either.  There are exceptions to every rule, but you might have an unrealistic or uninformed view of what other players have done to achieve and maintain their standing relative to yourself.

When you are in the lower ratings that just seems to be normal, part of getting better is being more consistent.pretty much anyone below 2k I'd think

Can I suggest a more appropriate profile picture for you?

Sometimes you play well and sometimes you suck. Why is that ?

It's because you don't always play well and you don't always suck.

Consistency is key.

Quality vs. quanity.  It's not how often you suck, it's how well you suck.

I play half my games half as well as I would like to and half of my opponents half as well as they deserve.

2 possibilities :

1- your play fluctuates

2- you play against different opponents

First reason is clear by itself, your pshychology, energy, concentration, interest is not constant.

Second, playing your a game is harder against better opponents, finding best moves are far easier against worse opponents, its real thing, just play 3-4 bad moves and your 1900 opponent will play like engine, but keep him at equal position like 40 moves he usually starts blundering badly (from my OTB experience). I myself experience it too, if my opponents let me build and easy position sometimes i can play flawless %99 engine aproval and feel like gm, next game pink dreams collapse when my opponent is good at creating difficulties for me :)

It's not trolling if it's true lol