Ramblings of a 20 something year old

Not to get too deep here... but are you living the life you thought you would be when you were 10 years old? What about when you were 15? I know I'm not. When I was 10 I was either going to be a Marine Biologist or a professional soccer player. Then at 15, I was planning on going to law school. Obviously, I'm not doing any of those things. When do things change? When do we decide to stop following a dream? Are we suppose to try a bunch of things before really deciding what we should be doing (ex: "Eat, Pray, Love")? Are you suppose to be working just for a paycheck, or are you suppose to be doing what you love regardless of the pay? I've been struggling with this concept for the last few years (basically since I graduated college) and I still haven't came up with a concrete answer. If you know me, you know I pick up a new dream every year. For example, a few years ago I was going to move to Nashville with no job and figure it out when I got there, then I thought I'd attempt law school again (didn't get in, but probably a blessing!), and now I'm hoping to get into physical therapy school (I actually really enjoy it!). I want to be successful, but at this point, I feel as if I'm almost running out of time. I know success doesn't come over night but you do have to start somewhere, right? So... where to start? What a question. If you figure out the answers, please let me know.