Could this not be IBS after all?

I've had digestion problems on and off for a while now. I have anxiety and I get stressed out easily. Sometimes i can feel bloated and I have lots of gas. In the beginning, I had blood and mucus problems, but they were never in my stool they were separated from it. like sometimes when i had a bowel movement it would just be mucus and blood, but then my stools would look normal. I could feel it coming on when i was having an episode, it felt like a pinching sensation and going through it felt like hell. It's been a couple of years since then and my symptoms have gotten a lot better, i don't have blood. but i have mucus when i get bloated. I have bad gas problems and maybe at times constipation but it's not anything like it used to be.

back when it was bad I went to many different doctors and got my stool tested, but my stool was always fine and since my episodes were sporadic I never gave them a sample of the mucus. I also never got a colonoscopy. I diagnosed myself with IBS, it made sense to me because of my anxiety and stress levels also i didnt want to scare myself into thinking that having a polyp was a possibility especially because im so young. Also, the doctors didn't seem to think it was that serious, they said that it wasn't killing me and i kind of felt like they thought i was making things up because when they tested my stool everything seemed normal.

but im still having slight problems, I don't want to have to worry in college about bad gas and digestive issues, I'm starting to think maybe i should get a colonoscopy, but at the same time i really dont want to because I feel like the doctors will think im nuts when nothing shows up. I've been to so many doctors and none of them really helped me or showed any sympathy. In fact, this horrible condition of mine has given me a negative outlook on doctors.

i read somewhere that doctors rarely diagnose their patients with IBS, and not once was IBS ever mentioned when i described my symptoms which in my opinion is crazy. but i've also read some where that if you have any bleeding whatsoever that it isn't IBS, which makes me nervous since i did have some bleeding.

do you think i should plan a colonoscopy?

im 17 and female btw.