I'm scared to meet him

I used to go to primary school with this guy and we drifted apart as we went to different high schools. He really wants to meet me in real life as we have only been talking over snapchat. I'm really scared that if i meet him in real life that he will think i'm fat and then i would have ruined a potential relationship. I know it may sound silly but i have really bad self esteem and i feel like my appearance has ruined every relationship. I just see a future with him and i don't know if i'm ready to let it fail yet.

- Help !!