Could it be cancer?

I've been researching online, and kind of scared of colon cancer. March of 2014 after a Antibiotic treatment my bowels went down. Before that treatment I was suffering from constipation. However, I dont have a constipation problem now. My problem now is soft stools, and sometimes they're light brown. Doesnt look nothing like my normal stool.

Its been over a year, and I've tried many probiotics, kefir, and the probiotic did help some, but Im still not back to normal.

Im now worried this maybe a more serious issue like colon cancer. Im 33 years old, and I've been reading its rare for someone my age, but not impossible. I dont have insurance and cant get to a G.I. doctor anytime soon.

Any suggestions and advice is appreciated. Tweet