Even if you haven't graduated from highschool yet, you should still be able to secure a position for better than minimum wage. It might be worth it to consider employment elsewhere if the pay is higher, especially if the environment is better. If you can secure one, an office job - even a secretarial or copy-boy position - can often be used very effectively on a resume.
That said, there are a few things to remember about any part-time retail job.
First, a lot of your experience (and hours) at the store will be dependent on your managers and coworkers. If you don't like the people, you probably won't like the job. Conversely, great people can add enjoyment to an otherwise poor quality position.
Second, consider your benefits. In retail, your primary benefits are going to be some nominal discount (often around 10%), which might just cover sales tax (which you probably have, considering your high minimum wage). Still, it might be worth it if you already spend (or plan on spending) much of your earned income at your place of employment. As a minor, I'm guessing this job isn't to pay rent or bills - maybe just gas and spending money. See if there are any additional benefits available. I'd heard some stores allow employees to temporarily borrow games they have in-stock. Look into it.
Third, customers will (often) suck. That's actually a good thing, because it will help you deal with difficult people later in life. If there's one thing good about the retail work I did back in highschool, it's that the demands of a customer-facing position forced me to overcome my natural introversion. That, plus some luck and a few good positions in college, was key in landing me an excellent job after university.
Fourth, retail employees are a dime a dozen. Don't expect to get much in the way of raises, job security, or respect. At your age, this isn't really that important, but you should at least be aware.
So, should you go to Gamestop? It's really your call. You could certainly do worse for a first job. Heck, it never hurts to apply, and at least you'll get some interview experience. Just consider the pros and cons before you accept the position.
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