I would always say that graduate school is a very realistic option for anyone in today's world. Although many people think it's too expensive, traveling too much, not enough time, other obligations, I would highly recommend looking into online education in regards to getting your masters. Not only for the standard reasons like most people say, but also for the fact that it's a great degree with great career opportunities following your completion. One website I would take a look at is http://www.maa.org/careers/
which is a page that shows multiple career's you can take after getting a degree in math.
Another website that I would take a look at would be http://www.onlinemathdegrees.org
which is a website that shows a great program that is offered to students looking to go to grad school, salaries coming out of college, growth etc. I would highly recommend checking some of the different resources online in order to find a program that best fits what you are looking for. You should never count of going to grad school because in my opinion, everyone has the ability to complete their masters, they just need to find the right program.
best of luck!