Am I rushing by wanting to get married?

I am 21 years old. My boyfriend is 22, almost 23. We have been dating for over a year and a half. It's a long story, but in a nutshell, I met him when I was 17, and we had an instant connection, like nothing else before. We were each with other people, but in 2009, we ended our other relationships, and started dating. I had never wanted anything so bad but to be with him. We get along perfectly, and have an amazing friendship and relationship. Right away, only a few months into dating, we knew that we wanted to be with one another forever. It's been hard through school and work and everything else because we don't see each other as much as other couples do. My parents are always telling me "you're still so young to be so serious with one person" or "you have your whole life ahead of you" or "We don't like you being this serious, you're only 21" Yet, I feel like this is right. Last week, he told me that he started looking at engagement rings. He has picked one out, and wants to talk to my parents by the end of this year about marrying me. I am excited. But I know they won't be. I'm actually afraid to know what they'll say or do. They think I'm rushing life. He wants to get engaged by the end of this year, but we wouldn't be getting married until probably 2013 - He graduated from college this past May, and I graduate in December. So we want to get jobs, make some money, and start building a house first. Am I, at 21, rushing life too much??? I would not be married until I was at least 23. I feel like it's right, but because everyone else is telling me how soon this is, it's making me feel like no one has faith in me, my boyfriend, and our relationship.