With youth: How to have no regrets?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Question: Sir, I often get affected by others. I depend on others to tell me what is right and what is wrong, and when that happens I often find myself regretting later. Later, I feel disappointed that why did I allow myself to be affected by others' opinions, words, actions, and whatsoever. How to have no regrets?