Help Please

I’m 25 year old and dating this guy for seven years. He ask me that we are going to get marry by the end of may this year. But I’m kind of scare to do it, he said I don’t want to then he would let me go. So, I didn’t tell him that I’m scare of it but I told him yes I will marry him. It going to ruie all my fun that I still want to have and I haven’t move out on my own yet and explore. I still want to do that. Back some years ago I ask him to marry me but he said no and wait till he done with school but some how now he change his mind. When I brought it up that he said that, he was like just tell me that you don’t want to marry me. I told him that I didn’t said that I don’t want to marry you. I just told him what he said to me. I think that he think I don’t want to marry him. I do but why It so soon like this year. I kind of feel scare in a way that he don’t even know how I feel, that he would dump me for it. That why I got to do it and marry him. It have been to long for us for going out this long. I guess, so help please…:(