Having Sex with male/female (VIRGIN)

Okay so I'm a virgin and I've never really dated many guys (only 2). The longest I've dated someone was 4 months... I really want to have sex, but I don't want to because I'm so insecure about my body.. I have this mindset that you have to be skinny and fit. Even if you have sex with a women.. (Btw, I'm very curious about trying). I know sex involves love, but there's no one that loves me in that way and who knows where he is. I just want to have fun and feel good. Any advice or opinions?