Two roads diverged in a yellow wood,

And sorry I could not travel both.

It is inevitable to feel sad knowing that friends are starting to go their own separate ways to begin their lives. Especially those who are going the paths where you once trotted with such carefree abandonment. While you feel happy and excited for them, you know you are not them and is unlikely to go down those paths again. That's why it's important to follow your heart. Listening to others can be good, but ultimately, it is you yourself who has to walk the road you chose.

So listen to yourself and follow your own heart.