Hey Emily!
First of all, good job on the essay! It's well written! :-)
I don't think I can point out any errors here.
Lady Gaga has incomparable valor and prowess. She teaches the individual to cultivate his or her inner bravery, and stand up against the rest of the world. If one doesn't take a stand, someone else will.
I think this probably highlights the essay's main point right? ---- The Advice.
I just feel that the way you've put it Lady Gaga sounds more of a
role model, than a person who advised you... Maybe a little towards the end you should you could change it a bit to answer the question maybe a little more directly. (That's just my opinion, maybe I am over-analyzing it a bit! )
And I don't think using Lady gaga is a bad idea. :-)
Just one pointer : Don't rely on Gaga to make your essay stand out, rather use Gaga as an example to enhance your writing. It really doesn't matter who you choose, rather it's about how you use the person in your writing. :) Do you get what I'm trying to say?
Other than that, it's all good!
Hope I could help you...
Good Luck!
PS - I wrote a college essay on Lady Gaga tool! So don't worry. I don't think it's risky if you can manage to use her to answer your prompt well. :)