Can anybody advice me? i cant comunicate or concentrate help me out please..?

hello everyone i really need help it seems like i cant talk to anyone i cant think of what to say i cant concentrate on anything i cant get a job or anything not even a girlfriend... :( im scared of everything ... i think this is the outcome of smoking weed for like 2 years but i havent for like a month now ... it came to a point were i would smoke weed non stop... im not sure if this is why this is happening to me but i really need help! what can i do? i want more confidence i wanna be normal i know im not normal i cant have a normal conversation with anyone not even my family members... its really hard for me me to do anything....i smoke cigarretes alot too idk if that would have anything to do with it i thought if i stoped smoking weed it would help but it feels as if im getting worst every day. but one of my biggest problems is i cant comunicate i process everything i say nothing comes out normal i have to try hard to comunicate and to say stuff idk how to explain myself its like im never on auto pilot its like i process everything i say .. my dad had depression and so did my grandma maybe its something hereditary but im sure i dont have depression its something else becasue i wanna be normal i use to no be like this what can i do?? please help! I am so stressed, I cant learn things because i dont understand and find it hard, i cant follow peoples conversations, and i cant start one, I dont understand the story on tv so I just watch the people. When someone tells me a story its like learning a different language. I just smile or nodd my head when they finish just to agree with them. I walk out of places and cant remember what was said. I just want to sit and stare and drift away. I ask someone something and when they talk i dont listen, i cant pay attention, concentrate or think My point is, is this a condition? Whats your advice? Please, I need help before I go nuts.