Sometimes i feel like life isnt real? And i have morbid thoughts of like driving my car into a lake?

Does anyone else feel like this ever? Sometimes to me it feels like life is like a movie. Like I dont really feel all there you know? I dont feel alive sometimes. I dont know why i havnt always felt like this, but at my construction job sometimes i feel like im just going through the motions and im not all there... it makes me depressed. The only time i really do feel alive and not like lifes fake is like when i go snowboarding and stuff. But its really getting me down. What should i do? Does anyone else feel like this?