>>742015
Don't worry about it, just trust God and keep going. Just because you get intrusive thoughts doesn't mean you're under demonic oppression. Keep reading your Bible and praying, go to church and spend time with other Christians who will encourage you.
About repentance - repenting doesn't just mean you stop doing a bad thing - it means you have a change of heart about that sin and no longer desire it. Pray to God that he would help you to have that change of heart and turn away from sin, and don't be discouraged if it doesn't happen right away. You say that you don't feel guilty, but clearly you do have some conviction about your sin because you're posting here asking for help. God doesn't need you to be heartbroken and lamenting over every sin that you commit, He knows your heart, as long as you understand what sin is and acknowledge your errors before God you can be forgiven. It would be a different story if you were proud and happy about your sin which you obviously are not.
Remember that you are never beyond salvation and God will never turn you away if you seek Him. If you continue to earnestly seek God then you will develop strong faith.