I don't have a PMP, but I do know quite a few of them who have never actually
managed a project. Theirs is just "book larnin'." It's rather like trying to learn about swimming by reading a book.
Good project management is mostly a human skill: diplomacy, tact, patience, eye contact, and the ability to juggle many things at one time. I think that you should
do it for several years (see if you actually
like the work
and if you are actually good at it ...), then pursue any certifications that you think might be advantageous to you.