I don't know who needs to hear this, but she doesn't really mean that, she just doesn't know how to gently let you know that she doesn't find you attractive. Get clothes that fit you, wash your ass, style your hair somewhat, and get a cool hobby you can passionately talk about. If you're fat, do a few pushups every morning and cut back on carbs. But don't do all this for her though, do this for yourself. It feels good to know that people find you attractive, plus you will have plenty of options throughout your life, and the sooner you get started, the sooner you start reaping those rewards.