On your profile page on the right side bar you'll see each type of Chess. Click on Online chess and it will tell you how many games you've played (65) :)
How to know how many games i have played?

Go to your Profile page then scroll down to stats, there you can see how many games you have played.

How do I find out about the games won and lost by me?
You can look at your stats. Home > Stats

But Stats only show the number of games played it is not showing how many of them I won and how many I have lost

But Stats only show the number of games played it is not showing how many of them I won and how many I have lost
In your profile, click on the word "stats" on the right, then click on the section you want, for example blitz, and a page with details will open. There you can find the number and percentage of wins, draws and losses.

In your profile, you can also just click on a section (let's say blitz) on the right and then onto the graph or the words "Full Stats" at the bottom. The page with the full stats will open.

But Stats only show the number of games played it is not showing how many of them I won and how many I have lost
Yeah, it shows that:
You can also look on your homepage/profile for the stats section.
OK, I tried to join one tournament but it said that I have to complete at least 100 online games to join. I dont know how many games i have played, but i think its nearly 100 games. So does any one know how to see the amount of games i have played? Plus does it still count if I have played the games last year ?