Crush rejection?

I just got rejected by my crush after 5 months of being led on. He flirted with me, called me pretty and all this other shit. I confessed my feelings and he told me he didn't feel the same. I'm so just...angry and sad? I thought that after so long I might have finally found someone who liked me back and all of that hope has been completely shattered. Now I feel like there's something wrong with me, that I'm ugly and annoying and shit like that all because I can't think of any other reason for no one to not like me.