Paranoia problem

i found out my paranoia problem from a song called papercut by linkin park.please look for the lyrics to know more .i feel like a stupid and useless person living in this world.i told my parents about this but they dont believe me.before i have this paranoia problem my life was great ,im able to do things fast ,think fast.when i got this paranoia things went bad, i feel like my life was destroyed.i cant even do a single things ,im thinking slow.do things slow like washing dishes other people takes 10min to wash it but i takes 40mins or maybe 1 hour .it is not that i dont want to do it fast but something has caused me to become slow and useless.i hope someone have this problem too or else i have difficulties to explain the unexplainable things.please forgive my english