Don't ever feel like God's mercy is not for you. There is nothing He will not forgive. You just need to allow Him to cleanse you.
I know that so many people discount God now-a-days, but this is surely their loss, for they are wasting their opportunity for salvation.
Why live in sin when God is waiting to change your wicked heart and cleanse you? Don’t let your guilt stop you from His forgiveness.
Ephesians 5:17-20 (KJV)
17 Wherefore be ye not unwise, but understanding what the will of the Lord is.
18 And be not drunk with wine, wherein is excess; but be filled with the Spirit;
19 Speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord;
20 Giving thanks always for all things unto God and the Father in the name of our Lord Jesus Christ;
Go all in for God. Seek Him each day. Read the Bible and pray that you may know and do His will.