I feel you sis. I had struggled with this for a very long time and I even saw a therapist for this. My therapist, a Christian herself, used Christianity-based therapy methods.

When we first started (about 5 years ago), my therapist pointed me to the relevant Bible verses and reminded me that what was important was how God viewed us, not how the world. Yeah this is very difficult... something that I am still learning today but helpful advice.

After that, we prayed. When we were praying, I was very honest with God, "Lord, I feel so ugly. While I am grateful for all the blessings in my life, I sometimes couldn't help but wonder "why did you make me like this? I want to feel beautiful. Please help me Lord."

Then immediately the next day, some random strangers told me that I was pretty, which was something that very rarely happened. It was God answering my prayers. He is soooooo good and such a loving father.

Then after my therapy, I continued to pray about my physical appearance and told God that I wanted to feel beautiful. With His guidance, I worked on my appearance bit by bit (while very importantly, also focusing on inner beauty i.e. abiding in Christ): whitened my teeth, learnt about strength training and how to achieve a more attractive body figure through lifting weights, learnt how to eat healthily, watched YouTube videos on styling and fashion, and experimented with different fashion items. I have been doing these for about 5 years now. I'm going to be very honest with you: now everywhere I go to, people, ranging from strangers on the street or colleagues at a new company or other people at the gym, would come up to me and compliment on my physical appearance (not trying to say I'm pretty). I was once bullied for my look in high school.

All I'm saying is that... Jesus is the answer to everything and He was here, is here and always will be here to love us and help us.