Shrooms aren't nearly that intense. If you have a normal dosage you aren't even gonna see things that aren't there, but your perception of things, especially patterns, are distorted and your senses feel more intertwined. It actually is not a big deal, the first time I did shrooms I purposely thought of the most fucked up shit I could imagine and it didn't make anything worse, it's all about your environment. If you're in a sketchy dark alley then you might start to bad trip, but even bad tripping isn't the sort of thing where you go and don't come back. You can start to bad trip because the shadows and noises around you are freaking you out, but it'll be fine once you're in a comfortable place again. edit: grammar