As obvious as it sounds, I strongly recommend shopping at a specialty bike store. They are the experts, and they will be able to help you decide which bike is best for you.
A friend of mine described it this way: When they were born it was like a meteor landed in our house and blew everything apart. We had to just put all the pieces back.
I was really lost for a while in my teens. I was angry. But when I found music - Bob Dylan, Neil Young, Joni Mitchell - it was a new discovery. It was a door to this other world where I wanted to be.