The Road Less Travelled By

Why is it that you can be so sure of something in the moment and it seems like the obvious thing to do, but doubt yourself completely when others don't stand behind your choice? I know everyone has their own opinions and likes to let people know them, but why do they affect me so much? Maybe I'm not sure of myself yet or maybe I'm still too weak to stand up for myself. All I want is for my family to see me as the new person that I am and to accept my decision. I know in my heart that it's good for both me and my family and that it's what is going to make me happy. Even though it's risky and maybe a bit foolish, why are they so certain that I'll fail? Maybe the difference between my dad and I is that, although we both can't see the end of the path, I can imagine it's beauty.