Should i confess or not?

Hi everyone.... Perhaps most friends of mine here in mylot, know that i am in a relationship now (otherwise i can say that i have my fiance). It is almost one month over and deep relationship and understandings are growing up. It is so hard to leave her at any cost for me. As this is going to be an everlasting relationship, hence i think there should not have anything to hide from each other. I have some demerits that i dont know whether i should confess to her or not before marriage? Like to mention that i drank but now i have lessened it as far as i can. I have told her that i smoked and now have lessened which has made her a little bit upset. So, when she will know that i was or am associated with drinking then she will get shocked as i have understood her from our conversation over phone. She may leave me. May be, not sure. Secondly, once i was kissed by a lady (discussion started here. No.2532397). When my fiance asked me regarding earlier relationship like this one, i was silent and told her that i will express later. (if i let her know this, her reaction is really hard to imagine). So should i confess this two matters to her earlier to marriage? Actually i dont wish to continue this relationship being a liar) Please advice. Shibham is busy these days with college exams.