It is unusual for a nineteen year old man to be involved with a twenty-four year old woman, but if God wills it then this won't stand in the way!
I too have had problems telling people how I feel. I once was totally besotted with someone for three years before I allowed him to know how I felt. Turned out he wanted my friend and not me and then he started being horrible to me. But at the end of the day, it turned out he wasn't the man I was convinced he was anyway! Things worked out for the better as I was young and he would probably have lured me into the sin of adultery. God was looking out for me three years before I even realised He is real!
If he truly is a man of God, then he will continue to be friends with you whatever happens. Just let God take control. If he wants you to be together, He will make it happen! He has a plan for you. Be excited.