Coming here and asking is not wasting time

As for taking the test, well that depends on what you want to do next in your life.
Enlisting is a 6 year commitment. The reason(s) you enlist need to be your own. Neither your parents, your friends, your extended family, nor a bunch of strangers on a website (albeit experienced strangers) can answer that question definitively for you.
If your only attraction was due to the possibility of being a Nuke welder, I would say take another path in your life.
If you really want to weld nuclear, check into (and part of me can't believe I'm saying this) CB&I and what they need at both Vogtle and V.C. Summer.
Best of luck!