At first I really thought I would wait until after I was married simply because that's what my parents told me I was supposed to do. So for a while i was like a super virgin and hadn't even held hands with a boy. I also had and still have serious trust issues (due to traumatic child hood experiences) so that's really the real reason why I never did anything. But then I got a little older and I started dating a little and I got over some of my issues and then I decided that I didn't have to wait to be married, I just needed to wait for the right one. And I did, and I found him, and we did.... and we're still together, and I love him, and he loves me.
Today is actually our anniversary =)
But as far as waiting for marriage if you really want to and you can, then go for it. But I think it's fine not to.