Could I Be a Schizophrenic

Well basically I am 18 years old and lately have been thinking, well obsessing that I am schizophrenic. Since an early age I have always been a very paranoid person but it’s been getting worse. I don’t hear voices as such; it’s my own voice thinking inside my head that I am schizo and I convince myself I am. It’s starting to affect my work, as I have been moody, one minute feeling very happy then next down in the dumps. I also keep thinking people aren’t understanding me when I talk and that I am not making any sense as they always ask me to repeat myself and to explain myself. I also think that people don’t like me or think I am strange or crazy. I feel like it is affecting my relationship I am in at the moment as I think up some bizarre scenarios, which I know aren’t real and are only in my head but for a slight moment believe they could be true. I just feel like everyone is against me at times and that I am driving myself crazy. I am too scared to talk to anyone about it as my parents would just think it’s me being a drama queen and I think my partner would just dump me in a second I need help or advise but I am too scared to go to a doctor.