Please Help, relationship and self esteem advice

I met this amazing guy only a guy months ago. Long story short he is perfect, I always tell him he is such a beautiful man and I’m starting to fall for him. The only thing is, he has a female best friend who he said he used to like. And I hate it, but I can’t help but to feel a certain type of way about how close they are. But I just came into his life so I feel like I don’t have very much of a say, so I just kinda lose it on him from time to time because I can’t help but feel like he still likes her and Was waiting for her until I came along…

He is African, and I am African American. We have two very different families… we were raised very different and I feel like our difference of culture clashes. Sometimes I feel like his parents wouldn’t like me, I have nothing going for myself and I just think I’m a very shallow person and sometimes I have to ask myself what does he see in me.. bc compared to me he seems like a very well rounded and responsible young man. Im afraid his parents won’t see a future with me and him. Meanwhile he tells me little things about his best friend that make me feel like his parents would see her more fit. He said her mom is always saying they’re going to get married.

I really cherish what we have but idk what to do about these feelings in my heart. Ive convinced myself he doesn’t actually want me and that I’m not good enough for him anyways. I convinced myself I’m not really who he wants, it’s her. And it’s tearing us a part, I’m always arguing with him over it. Please give me some kind of advice, I don’t wanna lose him over my own insecurities…