I know that feeling
I had totally convinced myself that I was ugly and useless, I'm not an a study, I don't have any talent, I'm just me. I was drowning in my insecurities and I felt like I wasn't worthy of life..
The worst thing (also the best but not in this situation) is I had the prettiest friends in class, around my neighborhood and everywhere I go I make very pretty friends.
The would talk about thier boyfriends and how they get annoyed by all the boys hitting on them. They would literally discuss all the boys who liked them and the me who is invisible to boys would just pretend I didn't care, but it was eating me insidet. This brewed into self hate
I have little sister
Smarter and very beautiful, I was always compared to her since she was born. This hurt me.
When I turned 18 I felt pathetic because I had never even kissed a guy no dated anyone.
My mom always told me that I was beautiful and I knew I couldn't change how I looked but that didn't stop me from praying and asking God to make me look beautiful.
The bible says that we are wonderfully and fearfully made, I know it's hard to believe considering our dameged self image. But if the Bible says so then it is soo. Let's learn to accept our appearance they way it is, we are beautiful and we should tell that to our selves more often. Never undermine the power of words.
It's okay to feel insecure sometimes but not all the times. Try praying, it helps. Jesus loves you.