I Am 23 Years Old Boy.. I Was Completely Fine

i am 23 years old boy.. i was completely fine and was active and bodybuilder.. i was in uni although before i used to think my parents donog show luv to me although i know they luv me!! one day i came to knew my eyesight is weak althogh it was little but i panicked. i got eyes glasses i wore them but felt i looked silly .. when i tooo them off i tgought i cant see perfectly.. one day something happened to me and i lost interest in everything.. then series of negative thoughts took me.. was in 8 semester .. my frnds told me i have changed this and that.. i haf thoughts like will i be able to complete my study , i had thoughts my memory had gone and it seemes real to me at that point.. i thought i cant read and write and do simple things... then after i di my degree i am jobless and had thoughts about my future that i will bcome a killer terrorist.. this and that. as left uni so no frnds and i also had emotins like alone unworthy and i am useless.. as i thought something wrng with my brain now i am useless and sucidal thoughts come to me. again sometimes i thibk i cant see well and i cant read and write which i know are just thoughts. but these thoughts are runing my life and leaeing to sucidal thoughts!! what should i do???