Been there. It gets better.

From what you describe, you've thrown yourself into your work but you don't feel really challenged or stretched. You also seem to have devoted yourself to your work (a plus--I get it) while ignoring some areas of your life that seem important (friends, hobbies).

Balance is really a key here. Work drives us. It provides rewards that can be quantified. But it isn't everything. Make time for self-care. Take a break. Accept that stepping off the treadmill is ok (essential, in fact).

Take time. Laugh. Goof off. Focus on relaxing. The earth (and the start-up) will continue to spin without you for a few hours.

hug