32 here with plenty of unspent ambition.

 

At that age, I would honestly say: feed that ego. You have the energy and drive to pursue something. Your truth. You have a rather concrete dream- something I, and I don't believe a lot of people had, at your age. Don't waste it proactively humbling yourself. You'll fail plenty.

But you'll learn so much. Networking, interpersonal skills, rote memorization are just a few things I can think of that actors are fantastic at. These skills are invaluable, hardly taught in school, and are often credited to natural talent or charisma.

 

It seems like you're worried about losing your "self" in vain pursuit and all the time that goes into it. But wanting to follow your dreams isn't being vain. It's being true to yourself.