I hallucinate a lot. How do I know if I have schizophrenia?

There is no way around it, you would really have to see a professional. Nobody can just tell you based off this symptom alone because schizophrenia is a pretty serious diagnosis and you’d want to know without a doubt that it’s a possibility. But for the fact you can ask yourself this is actually a decent sign, just generally speaking, because you aren’t egosyntonic- which happens when people are expressing abnormalities in behavior but don’t realize it. Absolutely go speak with someone certified about this and know that, a bright future is still 100% possible regardless of the outcome. Best wishes, love.