27/f constipation no family of colon ca had chronic constipation colonoscopy done showed sessile serrated adenoma so scared! why? am i going to get ca

Not anymore: Polyps are benign if removed early like you have done. Only if you neglect them and let them grow, they can change into cancer. You should be fine, but your doctor would likely advise you to have repeat colonoscopy every 5 years or at least every 10 years because there is small risk of developing new polyps . But there is no reason to worry about cancer as long as you are having colonoscopy as advi.

Talk to your GI doc: The prevalence of cancer in these lesions may be as high as 5-16%. If the GI doctor removed the polyp with negative margins you will need surveillance with colonoscopies (time intervals determined by your GI doctor) to make sure that if you get more polyps later on, they are detected and removed early (before they turn into cancer).

Serrated adenoma: Any other cancer history?. Get an opinion from a board certified colo-rectal surgeon you may just need close survelience colonoscopy of the polyp was totally benign and removed with clear margins.