First off you're not a loser. Everyone has different qualities about them that make them special....if he doesn't want to talk to you anymore because of a popularity issue, then he's not worth your time. He should not treat you any differently then he does now. You're the same person!
I like this guy but he's popular and I'm not and we talk on Snapchat almost every day so he doesn't know that I'm unpopular. I'm worried that when he finds out he won't want to talk to me and definitely won't think of me as anything more than a friend. What can I do to show him that I'm not a loser?
First thing here is that just because you feel that you're not "popular" does NOT make you a loser or a failure so don't think that. Not everyone can be or is popular so don't worry about and it really isn't all that it is made to be either. Just be yourself and he either accepts that or not and if not, then its his loss and hes being pretty shallow then. You just have to realize that you are the most popular person you know, so just be friends and if if anything is meant to be , it will happen. Believe in yourself and realize too that you're not going to impress everyone out here and many guys would rather be with girls that aren't so popular anyway. Good luck and Merry Christmas
First off if this guy is actually good enough for your awesome self he won't care. You don't have to prove yourself to him. Otherwise he is a total jerk. Don't worry he seems to like you for you so a label shouldn't matter if he likes you.