Well, i dont know what your religious affiliation is, but... ask God for forgiveness. When you repent, it means that you take a shift in the way u think, act, or do something. It means to walk in the total opposite direction. Ask God for forgiveness and pray about your situation :)
Pray, tell god what you did, because he already know's. Ask him to forgive you. Tell him what you learned from what you did. The bible say's "ask and ye shall receive". So ask. It doesn't mean to ask for a gift and you will get it. It means to ask god for forgiveness, and ask for him to help other's in sickness, and otherwise having hard time's.
Prayers, and asking forgiveness from God is OK. But one should also ask forgiveness from those he had done harm. One cannot steal and just pray for forgiveness. He should return what he stole, and ask forgiveness to the one he robbed.
The best thing to do is really pray to Jesus Christ.. tell him everything you have been going through... and everything you have done... YES! he does know everything about you... but he does LOVE to hear it from you...
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
See God gave his one and only son for you, me, and everyone... to take away our sins...but unless we pray and ask Jesus to take all that away from you.. it can't be done... and remember Jesus knows if your being serious or not... SO PRAY... TELL JESUS TO FORGIVE YOU AND MOLD YOU TO HIS DELIGHT.. and trust me you will feel the weight fall off!