It's different for romantic relationships. I've met online friends multiple times and they were all positive experiences, I was really surprised actually, no awkwardness at all, felt like meeting old friends. Never done LDRs, but I assisted to a friend meeting her LDR for the first time and she was completely turned off by him, she said she seemed very different online (more confident, more relaxed).
That being said, OP, I don't think you should be worried about being a bad kisser. I can't imagine what kind of turboslut would have an issue with their partner who they know never kissed anyone (I assume) being a bad kisser. I don't think you'll have any issues unless your bf has some ideas of who and what you are that aren't accurate. Sadly though, that is possible. The reason why some people aren't attracted to eachother anymore after they meet irl is because people tend to project their ideals and desires onto their (potential) partners and that's much easier to do online than in person. I don't think there's much you can do about that (other than trying to make sure you're not doing it on him), I know it's a bit scary, but try to be relaxed and act naturally. If you feel like kissing him do it. Chances are he might make the move before you get a chance to anyways. Good luck!