Meth is one tough nut to crack, so good on you for doing it! Meth is also one of the most destructive drugs there is..and if you like adrenaline rushes I can see why you were caught up it. I am so NOT an adrenaline junkie, but my husband is a bit of one. He likes to hike on glaciers and fast cars. If he had his way he'd be a professional race car driver. But he doesn't need any chemicals to get him going because he is ADHD.
I would encourage you, like others have to get into NA and tell yourself, it's okay to be alone. In fact, it's better to alone and clean than to be using with others. It may feel boring sometimes, but you can find healthy fun things to do that won't lead you back into a life with meth. I am like literally NEVER bored but I have heard that being bored for some people can be a trigger, so that's good you are aware of how you are feeling. Also, I don't know what you do for a living, but do you have a fulfilling career?