When he said this it set me back

I am feeling really down now. Today I was sitting there and my mom came up to me and there was a boy following her (he is a senior) and she said "now you better never bother this girl" (he has a reputation for "bothering" all the lowerclassmen) she is my daughter. and he said I wouldn't want her anyway.

and I mean I don't think I am ugly. and I have been called pretty and all that and good looking by the guy I like, but what he said kind of made me feel bad about myself. And I know his opinion doesn't even matter I don't even know him and he's not great looking. But I have had issues with the way I look for years because my older sister is just so gorgeous everyone overlooks me and goes on and on about how beautiful she is. And I have finally overcome all that and when he said that it kind of set me back.
When he said this it set me back
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