Am I just of low intelligence?

I'm stuck in the 500's and make stupid mistakes and blunders all the time. I don't know any openings so I just open randomly but, I think that knowing openings wouldn't really help me because of how bad the mistakes I make are. Am I wasting my time playing chess?

If you enjoy playing it, its not waste of a time. Basic opening principles are good enough at your rating to make your play better. I recommend ypu to watch series called Building habits by chessbrah yt channel, it will help you improve at chess. Make sure and double check on every move of yours has your opponent blundered a piece and will your move blunder a piece(give it for free).

Probably

Intelligence has little to do with chess ability.

Concrete opening lines will not help you, that is correct.

The biggest problem you have is time management. You play 10 minutes per side games (which is still a little short) and in many of those you spend 2-3 minutes of your time and lose pieces. 

You have 2 main goals if you wish to improve:

1) Playing longer games and slowing down while thinking about your moves (15|10 games should be the shortest games you play). You should aim to finish the game with less than half of your time remaining. That will help you achieve goal number 1 - decreasing the number of blunders

2) Learn opening principles and follow them which will help you to survive the opening with an acceptable position most of the time

Play a few games with longer time controls. Give yourself a chance to think a bit more. I’m by no means one to take advice from, just an opinion that may be helpful. 

It depends on how long you are 500+.

intelligence has absolutely nothing to do with chess ability so this question cannot be answered

Nobody gets stuck in the 500 elo due to lacking intelligence.  People get stuck at 2300 elo because they lack the natural aptitude.  They get stuck at 500 elo due to lack of practice and bad habits.

Taking a brief look at your games, the biggest leak that jumps out at me is you resign 70% of games often in positions that aren't actually lost.  What jumps out to me is not your lack of intelligence, but how easily you go on tilt after making a mistake and unnecessarily slap the resign button against players who hang their queens and accidentally stalemate games.  Having the perseverence to simply see every game to checkmate (while still trying to keep a low amount of losses to timeout) not only would boost your elo to the 600s, it would be an instructive lesson in how what's holding you back is not being a hopelessly low intelligence player, it's that you're being defeated psychologically.  If you don't believe me, try never resigning, and see if you're still below 600 in a hundred games.

The second is that you should work on fixing the simplest mistakes you make, and work your way up from there.  Like having a piece get attacked by another piece, and then not moving it out of the way, and it getting captured.  Or getting checkmated in 1 move.  Or not noticing a piece is attacked more than defended.  Maybe try the 15/10 time control and simply work on being able to refine your thought process so in the ~30 seconds you have to think about a move, you never miss a 1 move threat, don't even aim to win, just aim to not miss 1 move threats.  It's all about rewiring your brain to evaluate things more efficiently.  Consider chess puzzles or a tactics course.

Your openings are fine enough for your current rating level.

I wouldn't say learning a bit of chess is a waste of time, because you're stuck at a plateau that you can break through with the right mindset, and if you can learn to break through your chess plateau you can learn to break through other plateaus in life.