Losing Streak

I have a chess class every Monday, and I find that I would lose to just about every single person I play. On top of that, I'm the only girl in this class, so I feel left out and somehow, I feel that I have an obligation to not lose to the guys. But I lose anyway.

I know that I'm just starting out again from where I left off five years ago (when I quit playing chess), but the experience is somewhat depressing. I normally don't play as weak as I do in the Monday class (because in my school's chess club I've been playing very well against other kids). Our chess club president in school has been giving us lessons - which is very kind of him to do so, but it still isn't enough to improve my game. I don't want to give up on myself, because I know there is always room for improvement. What should I do?