I attempted to quit alcohol so many times I can't count them. I too would give in because I saw no point in quitting.
I finally hit rock bottom and knew I had to quit drinking or stay drunk 24/7 until I died an early death.
That was 4 months ago today...I am glad I chose to quit. It wasn't easy the first few months but it was worth it.
I am still not 100% - I may never be. But I am better off sober.
You will know in your heart and soul when it is time to stop the madness.