Liking two people

I thought I liked this boy and for about 6 months I would obsess over him but suddenly all my feelings towards him have gone and out of no where I've started liking this other boy! All my friends think I'm mad because our group and his group don't get along but me and 'Spencer' do. We always talk to each other in class (we sit together) and he always finds a way to make me laugh♥️.    Is it normal how I've gone from loving the first guy to not paying him any attention?    (P.s I'm 14 and need someone to talk to about these things).