There are a million ways to deal with a tempting vice. Like others have said, the key is to plan out the day and time you want to drink, along with a time and day to stop. If you've worked on improving yourself all week then enjoying a Friday night with a beer shouldn't feel guilty, it should feel like a much needed break from slaying your dragons.
If it makes you feel guilty then maybe deep down you believe you could have worked harder, or maybe you don't trust yourself to stop or overcome temptation. I'd advise making a plan and sticking to it. Sticking to it will increase self confidence and faith in your own resolve.
For example I have a rule to only let loose Friday nights. Saturday no matter how much I want to continue partying I will myself to start working on personal projects and getting shiit done instead.
I also plan week or month long vacations, and I have plans for the vacations as well. For instance I will have a plan to visit cities x, y, z, on day 1,2,3 and to only party certain days/times at certain places. Planning out like this makes for amazing experiences because I also plan for spontaneous things to happen. For example I always carry a condom but don't ever plan out sex, only windows for partying and being spontaneous.
Make a plan and stick to it. If you can't stick to it then keep changing it until you can. Then incrementally change it to be inline with your ideal self. It's amazing how many people don't realize this.
When you're confident in your plan you'll be confident in your power of self control and will learn to truly relax and enjoy yourself in those windows without guilt. In the past you may have drank to escape. Slowly change that to drinking to indulge.
Don't see partying as a drag. Use it as a break from working your as$ off. If I didn't party I would burnout, that's how hard I push myself in my craft. I look forward to that break and feel satisfied, never guilty.
It's good to see that you are working on yourself
@Blacksheep