Why does no one wanna be with me?

To my knowledge no one has had any interest in me for a long while and I’m starting to think it’s my fault and that it’s because I’m “fat” that no one wants to be with me. And I feel like no guy is ever going to want to be with and would be absolutely disgusted to even think about being with me sexually I’m just gotten very lonely and depressed over this issue. Does anyone else feel this way or have any advice