I need some advice...

So I’m 14 and I feel like I’m really fat and ugly but all my friends say I’m not and that I’m doing it for attention. However sometimes I get really down about it and cry a lot but it’s mainly when I’m with my boyfriend who I have been with for 8 months I get really upset and he feels bad because he wants to help me but all I see in myself is fatness and I don’t know what to do at all!