Will I make God angry by my sins before marriage?

Answer:

My first concern is that you were involved in fornication prior to becoming a Christian and continued afterward. Becoming a Christian involves several changes in life: learning and developing faith (Romans 10:17), being willing to admit your faith (Romans 10:8-10), changing your attitude regarding sin and your behavior (II Corinthians 7:10-11), and being baptized (Acts 2:38). All this combines to a person becoming a new creature, being born again. (See Are You a Born Again Christian?) It sounds as if you thought you can claim to be a Christian without really changing.

"Or do you not know that all of us who have been baptized into Christ Jesus have been baptized into His death? Therefore we have been buried with Him through baptism into death, so that as Christ was raised from the dead through the glory of the Father, so we too might walk in newness of life. For if we have become united with Him in the likeness of His death, certainly we shall also be in the likeness of His resurrection, knowing this, that our old self was crucified with Him, in order that our body of sin might be done away with, so that we would no longer be slaves to sin; for he who has died is freed from sin" (Romans 6:3-7).

I agree that you ought to marry, but until that day, it is more important that you change and become a true follower of Christ. God won't be angry because you do the right thing and marry her. His anger is for those who ignore His laws. In other words, you are currently facing God's anger by your choice to sin. Change and God offers forgiveness (I John 1:8-2:1).