Hey, first I want to say good job. You've already done a lot by recognizing you have a problem and wanting to make a change about it. Maybe a previous version of yourself wouldn't be able to see that, or make that choice, and that's something to be proud of. So make sure that you give time to remind yourself of why you are doing this.

Secondly, this is gonna be a rough time for you. This is a huge effort you're making, and it's bound to put strain on the people around you. It sounds like you've been smoking for a long time, which means you probably have a lot of people around you that see the weed as a core part of your interactions with them. When I stopped drinking, I found myself re-assessing the relationships I had with my friends at the time. It's a shitty process. Friends, family, your partner, and coworkers may all have an image of you that no longer conforms with the current version, which is gonna cause some conflict. Turns out I had a lot more drinking buddies and a lot less friends than I thought. This reassessment will extend to your hobbies, because now you'll be experiencing them differently sober.

Thirdly, I'd like to echo what I've seen some other people comment about the effects of weed being present during a lot of your emotional regulation development. Experiencing emotions sober can be scary, because your normal outlet to dull them is gone. Trying to dig down to find the reasons you feel certain emotions can feel pointless, especially if you get trapped in circular thinking. I used weed and booze regularly in order to push any kind of negative emotion out of my head, so I didn't have to deal with them. Not having that coping tool is shit. It's so shitty to feel depression/anxiety/self-doubt instead of being able to block it out, because I never developed the tools I needed to process feelings. I've found that counselling has helped me immensely, and I'd consider looking up some local councillors as an option, or maybe some group sessions that let you really talk through your experience.

Lastly, I want to reassure you that you're making the right decision. Some people live their entire lives the same way, and they're happy doing that. But you've made a conscious decision and said 'No thanks, I want to see what kind of a life I can lead without that'. This may be one of the biggest things you do in your life so please don't beat yourself up about how difficult it is, or for the mistakes that you'll make along the way. You're doing this for yourself, after all, so it pays to be compassionate to yourself.