38 is still very young. I am 43 and still working on my start-up. You might want to check out this book:

Noble Obsession: Charles Goodyear, Thomas Hancock, and the Race to Unlock the Greatest Industrial Secret of the 19th Century

http://www.amazon.com/Goodyear-Story-Inventors-Obsession-Str...

If you compare your situation to Mr. Goodyear, you will find out that you have much more than what he had. I hope this can help you recover from your depression. Just don't give up on your dream.