@MelvinGarvey's comment is the only one I agree with in this thread. I looked at some of your games and it appears as if you're severely underrated but just dropping pieces left and right without care. Fix this and you and your rating will be fine.
Referring to the original question about quitting: If you're not getting enjoyment out of playing chess, don't play it. It's as simple as that. Don't spend time on something that doesn't give you any pleasure. But if you do continue playing, you need to cut the blunders out before you're going to be able to improve
Apologies for my bluntness, just my two cents
Hola alguien habla español?