You seem to be having quite a hard time with bullying and unpleasant remarks from your family. No wonder your self esteem is through your boots. I'm not sure how you should best cope with this because ultimately it is your family and you know them best. I can say you have to learn how to love your self, and be at one with the body you have and the mind that berates it.
That said you have to find a way to stand your ground for their cruel behaviour. Who isn't insulting you in your family circles? Work out who is doing it and why? Small men big themselves up. Small women practice power play. Sometimes the best way forward is to find the defects or the physical irregularities that bother them (because they will have some) and keep them in reserve as ammunition. Be proud of yourself - no one is perfect - ever. Have you sometimes felt a spot on your face, and it feels huge, like really huge. Yet when you look in the mirror its like 'Is that it' and you can hardly see it?
Many of our perceived faults are magnified by our own minds. What we need to achieve is a thick skin and be comfortable with the whole, where you can give it 'yeah, so what'
What do your family get out of being cruel? Do they hide behind the verbals to others to boost their own insecurities? Do they do it because they know they score a direct hit every time and get some emotional mileage out of it by your reaction? Does it make them feel better when actually they are none too sure about themselves.
Just try - 'Hey/Oy - Be nice' and leave it at that. Look them in the eye.
Or say "Listen (what ever they perceive as a failed attribute they have - fat feet etc) leave it out." Just say "Yes that's me" and own it. They can't get to you if you are proud of your crooked teeth, big nose, cross eyes, flat feet, moon head, 7'00" height. Right? You can view it as a positive. If I can live with my size 10 feet, and if people want to laugh at me, while they do that, they are not laughing at anyone else. Take one for the team and feel proud you can hold the incoming fire.
How do you think some disabled people feel when they have adverse comments made about their disabilities in public? It takes a lot of courage to wear your body with pride. What you actually do with your physical self is far more important than the superficial image you passively want to portray. How shallow - if you don't have the movie star looks then you are not worthy - of ??? Well look around you and go out and meet all the people in your school, in your sixth form, in your Uni, in the town, the County, the UK Some of those people have the most awful disfigurements but have the proverbial skin of an alligator and have the inner confidence to say 'find someone else to bully' I am as I am. Katie Piper has courage in bucketfuls. What about young people scarred by open heart surgery, who have lost limbs to meningitis, been scarred by acne, involved in crashes, are burnt. They all find love because love is about connecting with and loving the soul and the bones of someone not just the superficial outer wrappings. Some of the best marriages are about loving the brain.
So how can you boost your self esteem? What are you good at? Everyone has something that they are proud of or good at. Go out there and join a club or start a sport, a hobby, gardening, cookery, cycling, swimming. Meet people. Volunteer to help others. The world is out there so don't be penned in my your family making comments. What are your aspirations in life? Reach for the stars and achieve them. Grit your teeth and believe in yourself. Don't let others remarks make you undergo something you feel will make you beautiful or 'the same' as everyone else. Who are they to say you need to look like someone else. You will waste a fortune. You only have to look at the £££ spent on lip fillers, cheek fillers, botox, creams, nose jobs, boob jobs to understand everyone is feeling vulnerable and wants to look like someone else. When you are happy in your skin and you just don't care what others think you are bombproof. Enjoy that feeling when you find it.
Meanwhile - you can do an awful amount of damage trying to eradicate something that probably 99% of people wouldn't even notice. Its only when you point it out to someone else and they go 'Where, what, what are you on about?' (then they are too busy thinking about themselves again) that they think you are a bit of an over thinker. So potentially you have damaged your skin to a very minor degree. Usually the crazy paving skin sloughs off and underneath is new stuff. There isn't a lot you can do but it will heal. Fortunately your youthful skin will heal very rapidly. Just don't be tempted to pick scabs or you will be scarred. Keep your skin clean and moisturised with E45 or similar face creams and it will heal itself beautifully. Keep it clean and make up free and in a few day/week the wrinkly scaly skin will disappear. If you are at all worried, you know the drill - seek professional medical advice.
Keep
and practice 'Shrug' - water off a ducks back to everyone else.
Your verbal tormentors sound like they are far more insecure than you will ever be