Anxiety or brain tumor?

My father was diagnosed with a brain tumor and so was my grandmother.The tumors are benign; however, I am a little worried about myself. Lately, I feel out of it, i have a hard time concentrating, listening to people when they speak to me, I get distracted very easily, and like confusion. I just turned 24 years old. I also notice I have to remember to breath or remember to blink. Isnt that my autonomic nervous system? I am worried I have something serious. I also checked out www.anxietycentre.com and it explains these can all be anxiety as well. I am on vitamins for anxiety though so I dont know if it anxiety. Is it common to have a brain tumor at such a young age? I know its possible but is it common? Any statistics