Afraid of showing him my body?

I’ve been dating a guy for a very short time, about two months. But we’ve connected so much and I’m head over heels.. I’ve never really dated or anything before. He’s my first kiss, first date and possibly first sex partner sometime soon. I’m 19, and 5’0 and 156lbs. I used to be 177lbs but I’ve been losing weight but still have more to lose. I’m not overly fat but my stomach is nowhere near flat, and I have stretch marks on my stomach as well as arms and legs. He’s only ever seen me clothed obviously and since it’s winter, even more clothed because it’s been cold. I trust him and he’s so loving but I’m so scared he’ll see that I’m fat and not like me anymore. I’m so afraid. :( I am so into him and don’t want to lose him whatsoever.