Happy?

Okay ladies could I possibly have some advice?

I’m with my boyfriend, have been for 8 months, and I’ve never been in a long term relationship before so the fact that we’re coming up to a year is really scaring me? I don’t know what it is but I don’t know If im fully happy like everything that he does ends up annoying me and he’s so clingy, he kind of possessive and I don’t know things just don’t feel the same, but I wouldn’t want to see him with anyone else and I don’t know if I’m being selfish or I’m just overthinking and going through a stage and this is normal to think? I adore him but I’m also only young (I’m 17) and kind of just want to have fun and I can’t because of him... I don’t know really, any advice? Thank you in advance 😅