Lately Ive Been Getting Constipated A Lot It Comes And

lately ive been getting constipated a lot it comes and goes.. i have to have like a lot of fiber in a day to maybe go at night. I take these fiber pills that are 4g but sometimes take 2. This one time i took 4 and went soon after but i'm so sick of being constipated! i also have fiber cereal and try at lunch a saled and dinner something else and a saled (not all the time) recently i went to the restroom because i took a laxitive but when i go i see this tissue like pinkish red also, i'm really scared because i'm only 16. I don't tell my mom because i dont know how to even say that.. i think it only happens when i push like hard and now ive learned about hemmorroids and thats terrifying because i do NOT want those.. i'm cutting sweets out of my diet to see if anything changes..