esther,
If you are talking about yourself, then the two of you are 18. I think that you should speak with you parents and Rabbeim. It seems that there may be some chemistry between the two or you, but there is more to married life than that. You should really hear what your parents and Rabbeim are saying; and not try to put words in their mouth; and not twist their words into something else. (in other words: the truth, the whole truth, and nothing but the truth in your asking guidance) In my opinion, if you get the go-ahead from all of them, then go for it. If not, then ask what should be done.
If you are asking for a friend, then apply the above to that young person.