Please do talk with a licensed mental health professional about the symptoms of feeling paranoid, believing that others can read your mind, feeling detached, and hearing people speak (who are not there). It's crucial that you talk with a board-certified psychiatrist, especially in case medication is recommended.
A lot of researchers apparently believe that quite a few mental disorders have a neuro-chemical basis and may be due to a chemical imbalance in the brain. That is why medication can be very effective in *helping* to treat people with mental illness. Please, however, do *not* try to provide a self-diagnosis or self-treatment, and instead make an appointment with a licensed mental health professional, including a board-certified psychiatrist.
This website may have some local counseling agencies, which may include a clinical psychologist (PhD or PsyD or a licensed-clinical social worker (LCSW), and there may also be an on-site psychiatrist, such as if medication is recommended:
https://findtreatment.samhsa.gov/ and can type one's zip code or state of residence into search.
Their toll-free 24/7 ** referral ** hotline:
1-800-662-HELP (4357).
If you're currently dealing with the symptoms of which you'd mentioned, especially hearing voices, for instance, then please either ask a trusted person to drive you to the nearest emergency room or call 9-1-1.