Why am I so nervous in my relationship after 3 months? it makes it hard to speak up?

Hi all, I'm usually a pretty bright, funny, & energetic girl & started dating this guy. Some of his behavior bothers me & I’ve been trying to bring it up, but for some reason I am still really nervous & uncomfortable around him. I’ve been deathly shy. I've had good relationships in past, but this just guy makes me feel real strange. Not sure why I can't speak up. He is very attractive & im pretty uncomfortable around him.

First of all, I love to laugh & make jokes/have fun. I am quite witty but when I say something or talk, he usually doesn’t notice or is turned away. He is a very serious guy, we hardly laugh together, but he is laughing and very witty around his friends. He isn’t like that with me & I noticed it immediately.

He’s quite serious & whenever I text him about my day or a fun surprise he just goes “oh. Very nice!” then changes the subject back to his work. He only cares about his work. I feel a little unseen. More than once, I’ve made a really funny, weird joke around his friends, & he dismisses me & tells them “oh that’s just her” and they laugh. I felt a little odd.

We never really have any fun, now that I think of it. We usually just hang at his house & I watch him produce music videos for his projects. He never wants to do anything else. I always invite him on weekends to places but he says “oh cool!” and then wants to work instead.

I loved him in beginning so not sure why I'm so nervous around this guy. He is real attractive & was sweet at beginning, but is intimidating now. I just feel really odd. I've never been so nervous around someone before/who is my boyfriend. Like I said, I used to be real confident. I feel like he doesn't really truly know anything about me? Like he’s fine at this surface level. Every time I bring up that he needs to do more/I don’t feel affection, he says he feels does enough & that’s just who he is. I'm a deep person & used to be really bubbly before this. My self esteem is quite low now. What do I do?
Why am I so nervous in my relationship after 3 months? it makes it hard to speak up?
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