If you are in therapy ask to take a personality inventory, like the
MMPI, that will get you some good answers. You can take it online but it's next to impossible to decipher on your own. If you're not in therapy, some colleges have mental health outreach programs that give you counseling for free. If you can get into one of those programs they can help you figure it out.
I have been diagnosed with schizophrenia and ptsd, on the mmpi I am nearly maxed out in both scales. I have been diagnosed as one or the other or both, by different doctors, I am also an aspie and have been diagnosed with borderline personality disorder. All that combined makes diagnosis tricky at best. However, with the exception of auditory hallucinations I have experienced every symptom that riss01 listed above, some times very severely for months at a time. I would say that if you're not experiencing that to some degree you're probably not schizophrenic.
On the up side I have been doing therapy weekly and taking an ssnri for a little over 8 months and I have been nearly symptom free for over 3 months now. The symptoms that have presented themselves have been manageable with some effort. A year ago if someone told me that, with some concerted effort and the right meds, I could be this good/level mentally and emotionally, I would have told them to take a hike.