Sweetheart;
When you pray... pray to the Father... use 1 John 1:9 - "If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness".... first thing in prayer.. naming your sins (fear and worry are sins), this is so that you are 'in fellowship' and your prayers can be heard and answered.
Be thankfull for all your blessings and pray for the people who bully you, pray for your enemies to hear the accurate and simple Gospel, giving them the opportunity for salvation through faith alone in the Christ alone.
There are over 7,000 promises in the Bible, but, they are like unopened presents, we only get them if we know them, claim them.... so.. claim promises such as
"Never take your own revenge, beloved, but leave room for the wrath of God, for it is written, VENGEANCE IS MINE, I WILL REPAY, says the Lord."
Romans 12:18-20
Or, "Do not fear, for I am with you;
Do not anxiously look about you, for I am your God.
I will strengthen you, surely I will help you,
Surely I will uphold you with My righteous right hand." Isaiah 41:10
"Casting all your cares on Him, for He cares for you." I Peter 5:7
Come to Me, all who are weary and heavy-laden, and I will give you rest." Matthew 11:27-29
And, of course, close your prayers in the name of Jesus Christ.
It is not easy to do -- but, you need to put all this into God's able hands, before the supreme court of heaven, and then leave it there. Let God take care of it and He will.
He never said it would be easy... these people / girls want to feel bigger than they are, they want to upset you and hurt you, don't let them. They are actually weak and insecure, hate themselves, or they wouldn't act this way. Your happiness depends on Who and What God is, who and what you are in Christ. Nothing in this world should be able to take away your inner joy... easier said than done, I know, we all fail in this area. Don't give these morons your happiness.
There is so much more after school... no one grows up to be a teenager, you have to look past this time and leave this problem in God's hands, ask Him for help and for His rest, His peace (of mind and soul). "This is the confidence which we have before Him, that, if we ask anything according to His will, He hears us."
1 John 5:13-15
Luck, love and prayers.