I have been experienced similar problems that you have listed,...and it Really does sound like you may be having schizophrenic symptoms,I also am in my early 20s and someone told me that it is very common for people our age to start developing schizophrenia at this time But I can't say for sure if you have schizophrenia though only a licensed professional can tell you what's wrong with you so your best bet is to go to that appointment you mentioned. And then you can go from there. I know what you're going through and I am sorry but just remember you're not alone! don't be afraid it's not going to ruin your life just look at it like an illness there are several people who have all kinds of illnesses who are famous and doing great in society you just gotta learn how to keep the illness treated and learn to live with it! I wish you the best of luck!