Ok. So firstly, I’ve been in a similar situation as you. I wasn’t body confident, but my boyfriend loved my body. Eventually you get over that part of it.
In regards to being more courageous sexually, the only way you know you won’t like it is if you try it. The best way to do this is to talk to your bf and tell him you’re kinda nervous about trying new things, but want to for him. Who knows! Maybe he’ll tell you that he’s happy with how things are going. Maybe he’ll tell you that he really appreciates you trying for him. Just make sure to set some boundaries so he knows when you’re uncomfortable.
The most important thing you need to do is be honest with your partner. Maybe you’ll find something you like!
Good luck :)