If you haven't had a medical issue yet in your life, this one is the first and you have to learn how to handle it.

When I was your age I had my first mammogram which came out positive. That was very hard on me. I'd find myself driving the wrong way down streets, and mulling on it all day long.
It was a painful learning experience about mortality and illness for me.

It turned out to be a "false" positive, after 3 more tests. And I was liberated !

My PN started in my 30's and mostly my feet hurt all night long.
I thought it was from my job which was all standing long hours.

I learned to focus on other things, and put that discomfort on the back burner. It is not easy, but one can do it.