Guys seeing you naked

Hey guys...kinda awkward topic: I was overweight most of my childhood and lost most of the weight very recently. I'm not very large anymore, but have some loose skin:( I look okay in clothes but hate my body when I'm not covered up. I'm 17 and a virgin, but I'm scared if I get into bed with a guy and he sees my body he'll just get up and leave. Does anyone have any advice?