Do I have schizophrenia or I am scammed by psychiatrist?

Hello,

I was feeling like I am mentally sick since 3-4 year. I often do unhinged things that doesn't make any sense. I constantly imagine things that's not the reality however I know it's not reality but I still smile thinking about those imaginary stuff and also I get depressed thinking the imaginary stuff. I don't hear any voice but I keep talking to people in my head. It's difficult for me to sympathize to other people. I can't even make any social connection because my brain will make some negative assumption toward that person who is actually a nice person.

I went to psychiatrist and he said I have schizophrenia and told that I need immediate treatment. he gave me 9 injections and medicines. I feel like I am scammed. I don't know I feel the same before and after the treatment. It also cost a lot of money around 1000$. I am so frustrated and don't know what to do.

any suggestions would be appreciated.

Edit: no, I didn't take the treatment from the first psychiatrist. I went to other psychiatrist and he came to the same conclusion. I was so scared atm that I didn't think much about it and went for the treatment.