How to stop smoking so much

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>inb4 dumb frogposter

I want to lay off the weed because it wastes my time, it makes me depressed and it takes up so much of my energy. Every time I smoke, it takes about 3-4 days to return to the normal state of the mind.

But I don't want to stop. Normal life is just too ugly. When I wake up sober in the morning, I just want to disappear and not exist anymore because the existence is painful. Every little thing that I have to do, every mundane daily task that I have to finish in order to continue living an ordinary life is just frightening.
Every phone call I have to make drives me insane with anxiety, every human I have to interact makes my guts tie up in a knot.

To make matters even worse, I only have one friend who hangs out with me and talks to me in the whole city - and she is a MASSIVE pothead and a borderline alcoholic. She smokes a lot. I think in the last several years I have never seen her not-high. And she also drinks a huge fucking lot.
But she is the only friend with whom I hang out with. She's like a sister to me. We have been through a lot of shit together, including a lot of shit with her criminal ex-bf and our amphetamine addiction, and I was always with her when she had a lot of shit going down and vice versa.
Nowdays, like I said, she is a huge stoner and she always treats me to a joint or two - and never lets me pay for it.

I just don't know how could I ever stop hanging out with her. I tried to talk to her about it, how would it be to lay off the weed a bit, but she is adamant about that she's never gonna stop.
I could refuse, I know, but I can't. I don't wanna. I love weed so much, and as long as I have access to it, I'm gonna fucking smoke it. And it's gonna make me depressed and everything.

I need my energy, I'm a math student. Mental energy is very important to my work. I've been salvaging it by taking enormous amounts of caffeine by now, but it's taking a toll on my sanity.

I fucking hate myself.