I wanted to know if it is ever a sin to marry as long as both are Christian but I found that answered but I had to decide if I should marry
Yes, but I'm saying that that's something that should be decided together with your girlfriend.
If you can't even talk about and decide that together, how are you going to deal with things, and make decisions, in your marriage?
I would not be with girlfriend if she does not want commitment it would be evil for one to be with me not to be commited
No, that's the wrong way round.
First you find someone, start a relationship, get to know them, find out if you have a future together and then both of you decide whether or not to get married.
If you took a girl on a date and said, "I want to get married and I can't be with you if you don't", she'll run a mile. She would need time to get to know you, as a person and Christian, before deciding that. You would need to talk about your ministries in any case - she might be called to preach; you might be against that. She might want to teach overseas; you might be assuming that she would stay at home and look after your children. She might not even want children.
Men and women can be in platonic, long term relationships without marrying - they might even go and marry someone else but want to keep you as a friend.
that is why I will marry and if she leaves she would be an adulterer and it is wrong for any to be with her.
Apart from all I have just said, a lot of clergy like to give marriage preparation, to make sure both partners fully understand what they are doing.
How do you think a Minister might react to being told, "I want to marry; if she doesn't and leaves me it will be her fault and she will be an adulterer"? Come to that, how do you think a woman might react to that?
I think maybe I am not as useful single and if I do fall in love with one it seems it would be good to consider marriage.
It may be.
But until, or unless, you fall in love, have a relationship and discuss marriage honestly with your girlfriend, you will never know.
Some people have no intention of getting married - then meet someone with whom they have a lot in common, fall in love and decide they want to be with this person. I have known Christian women very keen to have a husband and children, it hasn't happened for them and they've devoted themselves to being single. I've even known women who were single until they were in their late 50's and THEN married.
What I'm saying is that even if you were completely decided now, it might all change if you meet someone.