Growing a relationship involves growing intimacy (emotional, sexual, etc.).
Intimacy involves vulnerability; you become more intimate and thus more trusting and open with a person by virtue of the fact that you make yourself vulnerable in front of them and you learn that they will not abuse you.
It's also completely reasonable for you to refuse sex with a partner for any reason at any time if you don't want it.
Rather, intimacy has to grow organically and at its own pace.If you're not comfortable with being sexual, that's okay too.It's completely the right decision to not have sexual contact with your partner if you don't want to.It is commonly believed among Assemblies of God constituents that lenient attitudes toward sex before or outside of marriage are completely contrary to the clear teaching of Scripture.It is also felt that uncontrolled and irresponsible expressions of affection and sexual permissiveness are directly responsible for the breakdown of much in our society.