How do I seduce my boyfriend

We haven’t had sex in 3 weeks and it’s been like that for awhile. I hate it and the sexual tension I always have around him. I don’t think he finds me sexually attractive anymore, and every time I try to make moves on him he gets mad or says something along the lines of “ wtf are you doing” sooo I need some advice to spice our shit up. We don’t have any kids and we are young so that’s why I’m worried (: