I'm not sure how to make a vow of abstinence, could anyone help me?

its ok to make an abstinence vow if you are not one. abstinence is not only link to Christianity.
to make a vow, find someone who you would trust, a childhood friends who you are close with would be ideal. you could ask your parents but i would suggest not. it hard to explain why but its just better if its a close friends. when you make your vow, whatever relationship you are in, u are oblige to tell that person. whatever you do in that relationship you have to tell that person not in specific detail but in brief. so the person can be accountable for whatever actions and advice you.