I am 36 years old and, looks like, depressed

I earn well, as Senior Software Engineer Father no more, stays with my mum. Not married, couldn't make up my mind till around 28, and then went into 2 relationships (1 after another), but it was weird, because I didn't find myself committing. The current one (2nd one) had gone to great ups and downs, and I am still not sure. Job has become boring for me, but still continuing for the fat paycheck. Parallely I have always been trying something, and recently made my app live for a local service. It started okay, but I am the one man army here. So it becomes overwhelming for me to manage tech development, operations, marketing all myself. And its not an investable business, so difficult to find co-founder, and in fact I also didn't try actively. On weekends, mostly I am home. I have friends but don't talk about these deeply to them. Am I depressed? What is the most important thing I need out of so many things I am doing?