tight ponytails will cause your hair to break and fall out
they are bad, they are the devil
wear your hair in lose ponytails or pinned/tied up cute
don't shoot me, but long thin hair does not look good on anyone i know. there's not enough hair there. long hair is not for everyone - even though we all want it
if i were you i would cut your hair a little shorter, add some long layers to it to give it some texture and definition
my blow dryer is one of my best friends (kidding) and if you know how to use it on your hair (ie: don't use it until your hair has mostly air dried and is just damp, use low settings, point the blow dryer down on your hair, not up towards your ends) then you can minimize any damage and get fabulous, FULL looking hair. if your hair is thin, a good shampoo, like matrix amplify and some mouse could do wonders for you.
you might want long hair - but what style will really look best on you? your hair should brighten and accent your face - go to a stylist that can do just that!