Is it naive and unrealistic to think I might marry my college bf?

My bf and I are 19 and have been dating for five months. We get along so well. It’s not even that we have so much fun together. It’s more like we are just COMPATIBLE. we have the same views on life and we have the same values. Is it unreasonable to think I may be with him for the long haul? I don’t know. Everyone says your first love is amazing but never lasts but the idea of ever being without him hurts me to think about. We have a very mature relationship and are able to talk through all of our issues. We’ve really never had any. But still.

Anyone out there married someone they met their first year of college?