<human>: Can you succinctly summarize the text in 1-3 sentences?

So as the title says, I'm 19 and I have a girlfriend who just turned 17. In advance I'd like to say I'm not trying to use this girl or be a douche or an average pig guy.

To get a quick idea of what my girlfriend is like, she's 5 feet tall and like 98 pounds and has that very cute/innocent look and attitude to her. Whereas I'm 19, 6 foot 3, around 175 pounds of stocky muscly wrestler. So even if I end up going all the way I'm also concerned about hurting her. This is her first relationship and I was her first kiss. She's my second serious girlfriend and I am not a virgin.

How ever I'm just concerned because we've made it to second base (groping) and gotten some clothing off. Whenever I mention 3rd base she either shakes her head or gets a little disgusted (I think?). When ever I mention going all the way it's either no response or she wants to wait to marriage. When ever I make a move down there with my hand she either pushes it away or accepts it. I've never gone under her clothing down there but I can tell she enjoys it a bit while at the same time looks uncomfortable.

Now don't get me wrong, I really do love her and care a lot about her. I'm not just after sex but it has been a long time and I am really looking for some romance again since my last relationship ended about 9 months ago.
<bot>: I love this girl and I want to take it to the next step but she's really innocent and uncomfortable with it, what should I do?