Too shy to turn him on

Right, so I've been with my boyfriend for 2 years now. At the beginning he always started things and that was great for me because I've always been super shy when it comes to sex. He's also way more experienced than I am.

With time, we stopped doing as many things and recently he said that he's just bored of starting sex stuff every time which is fair enough. We agreed that we won't do anything unless I'm the one starting it.

I've been overthinking thins and hit a wall. I can't start it, I'm too shy. I just don't know how to turn him on and that makes me super sad and feel really bad about myself.

Any ideas?? I really need the help.