Hi, 24F here. Look, you two are still so young. She's not mature yet and doesn't even know how to be in a relationship more than likely, I think that's a red flag though trying to pick up on your friend. Also don't listen to that crap, you're not a shitty boyfriend, I mean you're on Reddit obviously trying to get advice to better understand your relationship, I think that's great. But if she doesn't like your friends without good reason, I wouldn't get serious with this girl. You need to find one that is more supportive of you. Anyways, keep your head up. At your age just focus on casual dating and try not to put too much heart into your girlfriends until you and them are old enough to understand your feelings.