I’m scared

I'm 17 and I'm so scared I might have colon cancer I have had constipation for a couple of weeks but I can pop at least once a day when usually I poo 3 or 2 times a day there is no blood I have checked every time but when when I try I get strained and only a little amount comes out for the past couple of days I have had a lot of water and fibre but I'm still constipated please help