I get what you're feeling completely and have felt the same way. First step is to recognize that Destiny really and truly is designed to manipulate your brain's pleasure/reward triggers to keep you playing (that's why the RNG and gated content are so absurdly grindy). Gamespot has a very insightful video (search for "Destiny: the Hardcore Gamer's Slot Machine") on Youtube. (Edit: video is now embedded/linked, above.) Second, just delete or get rid of the game--quit cold turkey. It's a game and it's not worth it if it's interfering with real life. I agree with the other commentors who suggest a new hobby (something productive or healthy if you can manage), but if you do pick up another game I recommend you avoid anything that is always-online (can't pause it). Best of luck to you.