Is it bad to settle down at 21 years old?

Hi! My boyfriend and I have been together for almost a year now and our relationship is great! we were friends for a year or so before we actually started dating so we have always had a good bond. We see each other every day pretty much, he stays the night at my apartment every night. we both work evenings and go to the same school so it just all collides well. we do a lot of different fun things at least once a week and we go to small group together for our church. we have talked about being together long term, forever basically. obviously change is inevitable but i like change as long as i have him in my life. we barely argue and if we do we know how to talk it out and end our night good no matter what. i just don’t know if we are too young to be this settled in our relationship. i mean i like the idea of dating someone since i was young and already have established this great connection then getting married. any other people dating someone since they were young ?? and / or advice to keep the love strong ? :)