Waiting

So Iam in love with this man and I want to marry this man and I love this man. I want to have sex with him so bad but I don't want to at the same time. I wanna make him wait but not wait too long I've only had sex once with one guy and that was 2 years ago Iam 18 and my boyfriend is 19 how long should I make him wait ? I'm making him wait cause I feel like it's a respect thing for me ya Know