You shouldn't think like that.
That kind of thinking can lead to disaster. I'm "talking" to you from experience. I always had my share of "suitors" that I rejected because I was too picky and they were just...
in my teenage years. In fact, I still dated guys that were just...
(flunking classes, no goals, runaways, etc) No wonder my parents never liked my bfs!
But you know, none of these guys was perfect and the guy with whom I lasted longest in a bf/gf relationship had acne, but he was very sweet and caring, even if he had no specific goals in life in a sense. He drives trucks now and has a wife and three kids, even though he is very plump and still gets acne.
In my case, in my early twenties I developed extremely bad acne. The guy that was my hugest crush ever kindly rejected me. (Yes, I actually confessed via love letter.
) Didn't last even two months and a half with another guy because he told me I didn't turn him on and then, my self-esteem crashed. I met then the guy I married. He had lots of issues and was extremely cold, volatile, and violent even against his mother. I was extremely afraid of him, but I thought that with my bad acne, no other guy would ever want me and this guy said that he loved me, even if my face looked so horrid along with many parts of my body, including my back, like in your case. (He actually said that too about my body and always pointed my imperfections to hurt me.
)
Anyway, I married this guy due to my low self-esteem issues and this decision only led me to lots and lots of suffering in his hands with violence against me, his mother, and then our daughters. In the end, we split after a death threat because I got even more scared and couldn't handle it any longer.
You're still quite young. You can visit a dermatologist if you think your acne is too severe, but don't let the issue put you down. Plus, not all girls are as shallow as to just reject you due to those issues so don't think you have no chance. You can also try seeing a counselor. Sometimes that helps.
Good luck with trying to gain confidence!