Like most, I do NOT believe in abuse. What I DO believe in is honor your father and mother, but PLEASE understand I'm not saying allow them to abuse you. Your father and mother have issues that are hurtful to you. It's not ok, but there's no easy answer...except prayer. I've been where you are and it took me YEARS to deal with the anger that festered. I'm sad that I couldn't let go of it sooner. Let me say again....what's happening is NOT ok. Pray and read God's Word and I pray God will show you how best to handle this. Once you're a little older, you may need to seek out a Christian counselor to help you put things into a healthy, Godly perspective. Please know that time will heal your wounds. That's probably not what you want to hear (I wouldn't have wanted to hear that myself when I was young). Just be cautious that you don't do as many women do and "marry" the equivalent of your father. Again, prayer and putting God first in your life will help with this. You might consider checking out Joyce Meyer online - her father molested her many times as a child and she's very open about how messed up her life was, but she forgave him. She and her husband moved him and her mom to live near her and she was good to him for a long time before he really acknowledged what she did. When he did, he apologized for what he'd done to her. While this situation is a little different than yours, it had an impact on her life that is similar to that of other forms of abuse. I'm not sure how helpful this is, but sometimes it helps just a little to know others have had similar experiences.
May God bless you as you live a Godly life, despite the hardships you're facing daily (and by the way, I believe these experiences helped shaped me in a positive way - through God...not the way you want things to be, but believe it or not, I'm now thankful for the difficulties I survived. I don't wish it on anyone and wouldn't want to go through it again - EVER, but I can now relate to others and probably have a gentler spirit as a result). I pray that your father and mother will recognize what they are doing to you and cease the abuse immediately. I pray that you will a light that reflects God's love for them and others in your life. I also pray that if nothing changes, doors will open so that you will be able to leave that situation. In Jesus' Name, Amen!
My heart goes out to you, as I know what you are living. It saddens me to know others must face this. Please know you are a TREASURE! Your weight, looks or anything external are simply not "who" you are. Yes, it is good to keep your weight down as part of health maintenance but it does NOT determine how good of a person you are, nor does it determine whether you are worthy of love. You are loved dearly by the Creator of this universe...the apple of His eye! You are also deeply loved by your brothers and sisters in Christ. When your dad begins his put-downs, quietly recite a favorite scripture so you can replace the evil that is being spoken by God's TRUTH. Truth is ONLY good. When you consider what is being said, remember it is NOT truth. God bless you always!