How can I become a better person? ?

So, I recently moved to a new school (I used to live in Mesa, Arizona, but now I live in Gilbert, Arizona, since July), and I've made SOME new friends, but not as much as I had at my old school. Or as I should have. There are a few close acquaintances, but they're not really close enough to call them friends. And, lately, I've been having trouble with, IDK, I guess relating to people? I guess you could say that. Because, in my Geometry cl, there was this really nice senior girl I met, & we sort of hit it off as friends pretty well, but after a little while she gradually started talking to these mean girls & now we don’t really talk anymore. Like, I sit BEHIND her now, instead of next to her, & she doesn’t really talk TO ME unless she needs help w/ her math homework or something. Like, I’m usually the one starting the short-lived conversations. And sometimes, I feel like I don’t fit in very well at my school. Like, my school is pretty ghetto, & sometimes I think that I might be the only non-ghetto one there, & that’s why I’m not really relating to people very well & I don’t feel like I fit in very well. Like, in Geometry cl, I feel kind of rejected by those girls & the senior girl…like, I feel kind of like a nobody to them. And I don't have a problem talking people; I just don’t always know what to say... I try to be as strong as possible, but sometime I feel like I’m just sort of slipping, you know? I just want more friends. So can you please help me?