The only major sin that you have commited dearest is that you have allowed yourself to fear the very religion that should be embracing you and wiping your tears away, but instead condemns you and that is such a tragedy for so many like you, who find real love outside the strict and controlled system you were born into. A system that has no place for personal feelings for women in love like you.
My Mother was a strict Roman Catholic and of course I was sent to a Roman Catholic school and because of that I was required to adhere to certain harsh and unecessary practices and sacrements, always afraid when I confessed to my Priest that my pennance would be unforgiveness for my 'seemingly' mortal sins, but then I discovered the Grace of God and the Gospel of Jesus Christ, which delivered me from the lies of men and their wicked bondage and condemnation.
I have many Muslim friends dearest one, who would answer you differently than I have, but you asked a question and in my own simple way I have tried to answer you. I wouldn't dare encourage you to become a Born Again Christian as I am, as your religion would have an even greater punishment to inflict upon you, than it already does, but I would encourage you to trust the faith of your own heart, it is far more merciful than anything that any man's religion can impose upon us. May God Bless you and hold you always in His loving arms.