Kinda lost on relationships

Im 19M and I have very little experience in romantic relationships. There was this one girl i talked to for a few months but she ended up just playing me, so that was that. Sometimes i feel like girls just aren’t interested in me because im somewhat immature, and im not sure if i should change that. It’s not in the sense of emotional maturity, but I’m in college and I still have a room filled with stuffed animals while my biggest hobby is collecting lego star wars, so not exactly things that attract women. I also have a job so it’s not like I don’t have anything going for myself, but I feel like my childish side is kind of a turn off for most girls, on top of the fact that im not that great looking (like a 5 at best). I’m also very bad at small talk and am usually too nervous to approach women on my own. Obviously I want to stay true to myself, but I also have the feeling that these are things I should probably give up if I want a better chance at a relationship because my looks and charisma don’t make up for it. Anyone have advice?