Use your head. Think logically.
Why did you drop out? There are always various reasons for such things, but for purposes of this discussion, the answer is- because nobody convinced you not to.
Now. Don't you wish somebody had convinced you not to? Don't you wish somebody wise (i.e. somebody who spent a lot of time and effort to become wise) had called on their experience and insight to help you understand how bad an idea it was? Don't you wish you'd had the kind of relationship with this person which would lead you to trust their advice over your own plans (now shown to be unwise, short-sighted, and a huge waste of time)? Don't you wish you could have started your adult life at a higher level, closer to your goals, less weighed down by regret?
Now you have an opportunity. You can choose to use your experience as a springboard, or you can choose to use it as a ball and chain. You can also pass this on to others. When you have children and grandchildren, do you want to tell them stories about how to live better than you did, or do you want to tell them stories about how pointless life is, grey, empty, with no silver lining to be found? Even in the workplace and in everyday life- do you want to mope, or do you want to shine? (Hint: which would you prefer others do when they're around you?) 
The silver lining isn't in the cloud- it's in your heart. And it's only there if you choose to put it there. If you choose to learn from this experience, grow into a bigger person, and teach others to do the same, then you can turn your choice from a mistake into a lesson. You can turn negative into positive, darkness into light, waste into wisdom. Now that is the kind of evolution I can get behind.
Even real silver isn't just found lying around- it has to be mined. It's up to you, man.