Am i going insane? or am i just crazy to start with?

Some times i think i'm absolutely insane, I can't stop thinking about my own existence. I had an hour long discussion with my dad bout it and he wants to take me to religious leaders..Sometimes i think aliens abducted me and plant thoughts into my head, and i'm terrified of them, But then i realized that, thats literally the same as Christianity. Really the only relief i get get is weed. It just blocks the thoughts in my head..It helps alot, but it's temporary. I shake my thoughts sometimes, i can't sleep because i have a crazy imagination and i run millions of crazy scenarios through my mind. Hell i don't even care about school\future\ anything besides video games, weed, cigs, friends, and love. My mind goes insane wondering about if i exist or not. Nobody really understands me, But socially i do fine because i hide it. The only people that make sence to me is stuff like twiztid, and some other stuff at psychopathic records... I don't know. I think i'm insane..could anybody help me? Also, I hate all religion. I think the only solid things in life are math and some science...I don't like deists and atheists. I don't really know how to describe myself..