Marriage?

Is it normal that marriage scares the hell out of me? I'm definitely a hopeless romantic and marriage is so sacred and important to me that I fear making the wrong decision and one day ending up unhappy or divorced. I love my boyfriend and I definitely think he is "the one" but whenever we talk about marriage I feel uneasy. I can imagine our future together but I think I'm just so afraid of making a wrong choice about such a huge commitment as well as judgement from others, is this crazy? I'm 23 and my boyfriend is 22, we've been together 2 years and we would be engaged already if it were all up to him.