This is happening all through our world, you are one of millions. You have let in demons, it is just one step and the direct result of our church telling us we don't need any Christian discipline. You are a victim, but you have let it in. Now you need help, as many, many need help.
Our church has let you down, I think it is up to our church to help you, and it takes hours and hours of prayer work, standing on the promises of God to help. If you don't look to what got you in this mess in the first place, then being made clean this time isn't going to do the job. Look in the gospels and read everything pertaining to Christ cleaning people and getting rid of evil spirits. It really takes a person knowledgeable about exorcism at this point, and that is almost impossible to find. Mention of it will get you laughed out of church, even. Posters here on cc will be lining up to tell me I am wrong.
We are living in a world that invites this into our life. Every actress and model you see dress in a way to exploit their sexuality, and looking sexy is considered proper and good. Knowledge of sex is just not accepted, only knowledge of secular sex devoid of any knowledge of what it truly is as God created it. You have a lot of learning to do, as well as getting rid of demons.
I would suggest you spend time filling your mind with scripture, any that appeals to you. Many psalms are wonderful. Then spend at least half an hour with your mind filled with God, in deep meditation on these things. You can use a prayer scarf or go to a church sanctuary, but go someplace where you feel closer to the God that surrounds us. Ask God to fill you and crowd out the demons in you.