You are not your body, or your 'looks', Ilimah, but you are your soul. And, as an adult, you are also (fully) responsible for what you think, say, and do. Had you ever thought that those with whom you communicate may simply love you for who you are? In other words, if you think, speak, and act kindly towards others - there is never any need to lie about anything - those with whom you communicate will simply accept you as they find you? Or not.
I believe you need to deeply and sincerely apologise to the person concerned. Say that you have not been very well - and that you hope she will find it in her heart to forgive you. Also that you understand if she never makes contact with you again. And then leave it at that.
Don't be afraid. You're a very young woman - have you explored ways to improve your appearance in your own eyes? Perhaps you could ask your parents to help.
Everyone makes mistakes - the most (and only) important thing is to learn from them. (Not to do it again).
GOD Bless you.
Elisha