Isn't it ironic?

Was just thinking to myself about me being introvert, and wanna be extrovert..but to come to think of it, I used to be the happy go lucky cheerful me and extremely friendly to everyone...even to strangers! But what has become of me, I am not quite sure.I still remember that when we talk about the difference between me and my sis, I will always say I am the playful outgoing type of person that hates to study..and my sis would be the quiet and introvert type and an A student whom all the teachers love.
But now, my sis has grown out of her introvert personality and loves to talk to people from anywhere! Her scuba diving hobby has helped her to open up herself to talk to the world and she has met so many different type of people since she has started her diving hobby.But as for me, I don't know why, but I have became an introvert.I think it's time for me to work this out and grow out of it.