BTW, did you know that ZeesKite played a major role in the discovery of electricity by Ben Franklin? If he can do it, anybody can.
Seriously, you should probably first think of what exactly is upsetting you. Try to identify an exact cause. Some people really have major reasons to be depressed Chas vShalom. I.e., poor health, handicap, constant physical pain or loss of a limb, no job, rejection from a school, broken shidduch, divorce, loss of a loved one, etc.
But if one doesn’t have any of these, then probably one is not counting his blessings properly. Many would give millions to be physically healthy and able to function.
Try setting huge goals. Study as hard as you can and try to get into the top program in the field you like the best. Make yourself into all you can be. Do a lot of chessed. Build projects. Become an expert in a particular craft. The more you can say you have done, the better you’ll feel.