Making the first move

So I’m 15 and I’m currently single and I’ve always been single. I’m interested this boy that’s in my grade but I never really had a reason to talk to him. The only problem is that I’m not the skinniest person and I’m short I’m only 4’11 and 1/2. I’ve also haven’t had the best luck with boys.... but I really want things to work out with him.