I have felt how you feel OP.
And I used to HATE it when people said "you need to love yourself" or "everyone is beautiful in their own way" (even though these things are true).
But a word to the wise - I changed lots of the things I hated about my looks and started to get the attention I thought I wanted and it didnt make me happier, I felt even worse because I thought feeling like I looked good would fix everything.
My earth came shattering down the first day I looked in the mirror and thought "oh I actually look ok" instead of feeling disgusted and self loathing. Because I really thought it'd make everything better and it didn't.
What I'm trying to say is as much as it sounds like bollocks at the moment (and I know it does) it will do you the world of good to look at why you feel this way - it's taken me years of counselling and pretty painful self awareness to make my peace with my looks. I even think I am pretty sometimes and then feel like I must be wrong.
People who haven't felt how you do now won't understand, but I do. Sorry this is a rambling post but I just want you to know you can come out the other side and feel ok - I wasted the best part of 25 years hating my appearance. I could have spent so much of that time having fun and enjoying life.
I still battle the thoughts about my looks on bad days but seem to care less about them, I used to be all consumed with self disgust and I feel so sad now looking back at a nice girl who was so very sad about herself :(
I bet you're a nice girl and I hope you find a way to not be sad anymore xx