If she is putting you down a lot you might consider whether you're in a healthy relationship or not. Maybe you should try gaining some weight? Find out what she thinks about your appearance, if she has changes, change them. Only change it enough to make it right
If she thinks you're gross, why is she still with you? My guess is she's manipulating you into thinking she's the best choice you've got by attempting to lower your confidence. In my opinion, this isn't a good woman to have in your life as it shows her lack of intelligence and character.
A different view:
Is it possible she's overweight and would feel better about being seen with you if you were, too? Have you heard the expression "God, if you can't make me thin, will you at least make my friends fat?". If she's even a little overweight, then this could be what's going on with her. You even said she tells you that you eat much less than her, so she may feel self conscious if she's overweight and you aren't. So if this is the case, it sounds like she's trying to pull you down so she will feel better about herself. But if she's not overweight, then maybe she's trying to 'conform' you to what her ideal man looks like.
And the next time she tells you that you need to gain weight, remind her of all the dangers that come with being overweight. Then ask her why, if she really cared for you, she would want you to risk your health by gaining weight? At only 17 years old, you most likely will gain weight in the next few years; most boys do as they reach maturity, so why make yourself gain weight now? If you feel you need to gain weight, that's different. But don't gain weight just because someone else tells you they want you to.
If she really cared about you, she would never say such hurtful things to you.
You should never let another person make you feel as though you need to change yourself for them; they either care about you as you are, or they don't. And if they don't, then find someone who does.
Based on the mean, cruel things she says to you, I think you may need to re-evaluate your relationship with her. I'm sure there are plenty of girls who would love to date you just the way you are.
He doesnt have a girlfriend.
the answer is no... he doesn't have a girlfriend
no he doesnt have a girlfriend but i would love to be his girlfriend
No he doesnt have a girlfriend hes single
No he doesnt have a girlfriend..
no he doesnt have a girlfriend
AWESOME BOOK, but you should read, what my mother doesnt know, before you read, what my girlfriend doesnt know... its the book before what my girlfriend doesnt know!
he doesnt have a girlfriend
oritse doesnt have a girlfriend
she doesnt have a girlfriend, or a boyfriend
he does not have one
he doesnt have a girlfriend he has a wife