Should I just quit?

Unless you have delusions of greatness, you're just like everyone else. You may as well stick to it--or find another pastime.

If you lose EVERY game you are obviously doing something wrong. Print out all of your games and then print out all of the games of a strong player on chess.com (me, for example ). Analyze both sets of games OVER A PHYSICAL CHESS board with a notepad handy and take note of all of the differences when it comes to habits, strategies and board vision. This will give you a big insight into your own play (the law of contrast is being used).

Once you've identifed your shortcomings in this way, systematically work on each weakness over a period and you'll be winning games in no time.

Good luck buddy! 

Don't try too hard to win, just try not to make mistakes...