TMI but advice? Help?

So my bf of almost 5 months now and I have been getting a little more active lately. We havent gone all the way, but he definitely wants to. I kind of do too, but at the same time I'm super paranoid about getting pregnant. I'm not on any birth control, but we would definitely be using a condom. However him and I are only 17 and I don't want to risk a teen pregnancy. I also have scars from sores that I get sometimes on my inner thighs and pubic area that he hasn't seen yet. I feel really embarrassed about them and I'm worried about what he'll think when he sees those. Any advice as to what to do?