Colon polyps and bleeding with stool.

Hi, I am a male of 21 years. When I was 15, I got my first Colon Polyp. I had my colonoscopy, it was removed and it wasn't of any worry. I developed two colon polyps at the later stage and it was diagonized when I went for routine check up in 19. The doctors said there was no need to remove them and gave me simple medication saying nothing to be worried about. From the last few months, I felt a pain in my colon sometimes and I had bleeding. Not frequently, at times. One day, i felt much uncomfortable, and put my finger in. I found one of the polyps completely disappeared and the other one in the place where I felt the pain. It was like a size of a pea and I felt pain at the place where the polyp is. Now I am going to doctor within a month. Till then, do I need to be worried?? Is it something much worse? I did not loose weight. My weight is 79 kg and my height is 5.9 ft. I dont have bowl problem. Is there much reason to worry? I dont smoke or drink. I quit smoking months ago.