In my case, I spent most of my life around 18-23 years old living in my parents' working about 100% of my time on something of my own I had a lot of negative support from friends, colleagues, and extended family as many don't see entrepreneurship with good eyes in Brazil.
The last project I worked (https://www.youtube.com/watch?v=dML0FQIUcTY, I spent 2013-2014 on it), was heading to the right direction, but then my business partner (first and last one so far) always wanted more and more.
In the end I had other opportunities (go back to college, and start a new job), and we just ditched all our efforts. Of course, we both regret it. Especially each time when we see something similar sold for a couple of millions.
Good luck to us next time!