Why do girls (teens) like having cute bras.?

i sit there and go ooooh thats a cute bra.!! i dont have any plain ones i have cheetah print, striped, hearts, laced, neon etc. but i dont really know whyyy. i mean 1)im only 14 going on 15 2)my soon to be boyfriend is a nerd 3)im catholic ...... so i highly doubt with all that anyone either than a few friendz spending the night will ever see my bra. so why do i sit there and pick out bras like they are going to be seen. i dont do it with underwear HECK im wearing tinker bell underwear right now.!! i only have spongebob, tinker bell and carebear undies so why do i like to have these fancy bras.!?!?!?