Im afraid to have sex because Im so skinny.

Hello, this is very embarrassing for me to talk about im a 18 male, im about 5,10 and weigh maybe 115 last time I checked. I have never wanted to have sex with anyone because I'm so self conscious about my body for 2 reasons one I just don't think I look good at all and I don't want someone else to see me and 2 from what I read from others and heard from girls I have talked to they said that having sex with someone skinny like me just hurts them and they don't really like to touch them. I don't want to cause anyone pain but anytime I have been in a situation that could lead somewhere its always really embarrassing and hard to find an excuse to not have sex. I would like to also that im a pretty shy person and I never had been to interested in sex. Im not saying I dont want it or anything its just sex for me was always secondary I much prefer getting to know the person stuff like that and then they get more intimate with me and I just get uncomfortable. I know that's a lot im sorry lol