Radar, I am Quit with you today. You and I are definitely "young-guns" compared to most up in here. I'm 25, and our stories are not all that different. Started smoking young, traded smoking for dip, couldn't function without nic. If I can do this, you CAN do this.
As to whether or not you 'change' as a person I think that the simple answer is Yes. However, whoever said that change was a bad thing? In this case, its more of a peeling of the onion than a metamorphic change. Things will become apparent to you, about you, that you never knew. Nicotine use shielded us from many aspects of ourselves and reduces our abilities to 'cope' with reality, the cold and angry bitch she can be at times. You will now, through the journey of your Quit (Which incidentally is also the rest of your life), have the opportunity to develop a stronger mind, resolve, soul...whatever you want to call it. In a nutshell, you will emerge a better YOU.
Enjoy the ride brother, you got a longggg life ahead of you...if you buy in %100 to what we offer.
CC