they pay attention to my older and "fun" cousin instead of me
im always leftout
it makes me sad
It not about being left out...i would think its more that your cousin is a chatty upfront person more so than your self,maybe the cousin has deep lying insecuritys that make him/her that way or maybe he/she is just a people person..dont mean you should be,or even confuse this attention with love .Give it a few years and i bet your cousin is somewhere else whilst its your turn .And it takes two to tango,try to get more involved with them all,dont be left out...refuse to be by being in.
Try to include yourself into the conversations. Start joking around with them and let your personality shine. I'm sure that your family isn't leaving you out intentionally.
Have you tried talking to them? Letting them know that you're feeling left out?