is it dumb to feel this way already?

ive been with my boyfriend for a little over 5 months now and ive been in previous href='http://mallibier2.vilablog.com/2011/02/21/does-he-still-like-me-or-did-i-ruin-it/'>relationships actually just got out of a 3 year relationship about a year ago buttttttt with my new boyfriend i feel so different with him like the workd love means something to me when i am with him i just dont know if its dumb to feel so committed and in ,love with a boy at only 18...??? and he is 19. like being together is a long timeeeeee and just wanna know if its stupid or dumb to feel this way like wanting ti be with him for a long time?