Happy birthday, Tasha!
I got money from my grandma once for my birthday and made the comment that now I can pay this or that. She got upset with me and told me that birthday money is to be spent on me, not on bills. It's a gift, not a bill payment.
While the responsible person inside of you is saying "Keep it in case you need it", the fun side of you needs to realize that you deserve pampering and gifts too.