Wow ok what happens next???!!!?!?

Alright so I'm kindof facing some boy struggles.

I'm 16 years old and I haven't had some of the best boyfriends. Actually for the most part, I haven't had boyfriends, just like hookups and stuff along those lines.

I'm currently dating this boy I really like who I met a couple of months ago.

Anyway, because of the past situations, I have really low expectations for my relationships, and even though I've been dating this guy for at least 2 weeks, I feel almost miserable because I have this idea he doesn't like me or he finds me boring or annoying, so I basically try to leave him alone as much as possible even though I'm dying to talk to him.

It's really odd to explain and I have major mood swings which I don't think he'd understand or find weird.

It's not all negative, and it's great spending time with him, but it's just over thinking everything is a problem.

Does this happen normally?? Should I discuss this with him??