I think you are worrying too much. It sounds like you are doing the right thing and taking it at her pace. Go where she will let you, and enjoy the ride, it only get better from here
My first experience was very similar to yours as well. We started just making out, then second base, third, etc. Within a month we were having sex. I think we were just both ready to explore our sexual nauture a bit more and just went for it. I am not saying it is going to go that far that fast for you, but rest easy knowing it is not uncommon at all.