I don't think my boyfriend is the one?

I do not think that he is the one for me, the one I am going to marry, the one I want to have children with, but I love him. We started dating when I was 18 and he was 19 now I am 20 and he is 21. Back then I knew that he was not the one for me when we started dating but I liked him and thought that it did not matter since we were so young. But now our friends are starting getting married, they are moving in together and this is not what I want with my boyfriend. I want to date him, be with him, but deep down I know he is not the one. He is the kindest and most loving person but I can not imagine spending our lives together. Should we keep dating?
I don't think my boyfriend is the one?
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