Hey Gillet!
That's one hell of a problem you have there. It's good that you realise that you have to solve this on your own, not for a girlfriend or a crush but for yourself. You need to.
As a second point, do you realise that you're addicted to weed? From your post it seemed that you see the weed as a consequence of your moodiness, but it may well be the cause. Seek help if you cannot quit on your own.
And as for trying to get the rest of your life back on track, if it were that easy you would have done it by now. But don't let that stop you from trying.
Stay in touch with your (ex)girlfriend, let her know how much you love her. Do tell her that you're trying to change and therefore cannot immediately get back together with her, though. She deserves better then what she got from you before, I think you'll agree. And let the crush slide. She's not who you really want, she's just your way of admitting your life before sucked. Change it, don't hide in drugs and crushes. You can do it.
Good luck.
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