I'm think about selling it, I like the game but I don't have any friends playing and playing online with randoms sucks, so I would be sticking around for that. I went to my local game store and they said I'll get $37.50.
 
Should I sell it?

I would, not having anyone to play with seems Infuriating. You can pick up Dragon Age 2 or something.

If you're not enjoying it, I don't see any reason why you should hang on to it.

" If you're not enjoying it, I don't see any reason why you should hang on to it. "

Admittedly getting rid of it quicker nets you the most cash, although if you're willing to jump through the hoops, ebay would be much closer to what you originally paid.

I'm probably going to get rid of my copy also since I found someone who wants to buy it for $55...not bad considering I only paid $39.

Sell it on eBay.  You will get more.

If you're considering it, you probably should.

I wouldn't trust the advice of anyone who would tell you to hang on to something you don't enjoy.  Sell.

Yah if you're not having fun sell it.
Though to give a bit of bolt the barn door advice, maybe you should rent games first in the future.

...that is the question

" I'm think about selling it, I like the game but I don't have any friends playing and playing online with randoms sucks, so I would be sticking around for that. I went to my local game store and they said I'll get $37.50. Should I sell it? "

If its not fun then your probably best trading it for something you will enjoy.

Would you be interested in playing online with people you didn't necessarily know if it were people from Giantbomb who would play online regularly? 
 
People are saying "If you don't like it, don't keep it" but you never actually said you don't find it fun, you just need people to play against. 
 
You're probably better off selling it, but I just wanted to put that other opinion out there. 
 
The other option is to get better friends :D

eBay.  You'll get 80 percent or more back if you kept it in good condition.