Too much time is spent worrying about what could have been, or what should have been. If just a fraction of the time we as a society spent lamenting was put toward accomplishment there would be some absolutely incredible things accomplished.
Just take a serious look at how you spend your days, make a note every time you have a conversation about not having any time to do the things that you want to do and while you're at it take a note as to how much time a day you spend watching TV and how much time you spend complaining about your job, the traffic and the weather. When you see just how much time you are wasting, maybe you'll begin to realize that you actually have plenty of time if you would just focus your energy on the appropriate activities.
If you can find 90 minutes a night to watch TV, an hour a day to surf the web and an hour on the phone talking to/texting your friends its probably pretty safe to assume that you could find a measly thirty minutes 3-4 times a week to get yourself in better shape.
All of us are only given the very same 24 hours in any given day, some of us are just more adept in focusing and using our time properly - once you get that focus and begin to make use of the ample time you have, you'll begin to see the results that you've been complaining were out of your reach.
So when tomorrow begins, make a concerted effort to save the time you would have otherwise used futilely and use it to start getting your butt in shape.