Talk to Jesus honestly. Repent to him of anything you realize you need to. Ask God to cleanse you on the inside, and then to allow you to see yourself as HE sees you. Read verses about how much God treasures and loves you, and of who you really are in Christ. Remind yourself of them (outloud if possible) every time those self-loathing thoughts come, because they are lies, so counter them with TRUTH. Eventually this new way of thinking will become a habit. Continue to read your Bible often. God bless you!