I think that The Road Not Taken is about finding yourself, in part. It's about how, sometimes, you should take the hard road. It will help build character, help you discover who you really are and what you really want. It talks about how the struggle is worth it, because it makes you who you are. The harder road may not always be a happy road, but it may just pay off, in the end.
I think that poems like The Road Not Taken are overdone. I think that the mantra of 'take the hard road' is tasteless. The act of character building does not have to involve suffering, whether it is physical, mental or emotional. Yes, people should have inner strength. No, people should not take the easy way because it is the easy way. But, not everything should be a battle. There should be a middle ground, where you have your strength, but be allowed to be happy, not weak, no weary, not sighing because you have no strength left to fight. Happy.*Written for English class.