Sorry to be so blunt, but that's exactly what my issue is about! 
I posted on here a few weeks ago about my situation. I'm 30, divorced, and quite recently started to see a new man that I met through my work. So, things have been going very well and now it's moved beyond just spending time together and getting more physical. So that is great on one hand, I really do want it to happen...but I'm so nervous at the same time!
I got married when I was really young and actually met my husband when I was a teenager, so he is the only man I've had any experience with in anything - relationships, love, sex...the idea of being with someone else scares me, even though this man is very sweet and patient.
Then my other problem is that I don't feel so good physically. My divorce (1 year ago now) was very stressful. In this year, I started having really bad sleeping problems, losing appetite, etc so because of that I lost so much weight and went through many periods of feeling weak and dizzy. I sometimes look at myself in the mirror and think that all that's left of me is bones. It's sad because I used to be so good and healthy. Obviously I'm working on getting back to how I used to be, but it's difficult to imagine being attractive to a man when I don't really feel good physically.
You gave me good advice last time, I want to go through with this but I'm so scared!