I hear you bro. I dedicated my whole undergrad to preparing for a research career and finally got into a top 10 back in 2010 but was asked to leave in 2011 as I didn't pass an exam (mom was in icu).
Long story short I went to work in the industry. Although I think I have learnt other useful life lessons, when all is done and dusted your calling will get back to you.
Besides politics and all are life skills that can be learned along the way.
So don't give up yet. It ain't over till the fat lady sings ^_^ I'm 31 by the way so it's never too old for you.