What’s the biggest obstacle you think young founders face?

While building StarterSky I realised mentorship is one of the biggest challenges for young founders and would be great to have someone to talk to. But starting a business comes with so many hurdles, which one do you think is the biggest roadblock?

1. Mentorship
2. Funding
3. Balancing studying/working with a startup
4. 4.Building a network?
5. 5. Any others?

Let me know.