Honestly I think your issue stems from the first paragraph. Sex and alcohol are not the only two ways to relieve stress and it sounds like you aren't interested in examining other areas. There are many many other, more healthier, ways to relieve stress. If the only reason you're having sex with random people is to relieve stress then I'd suggest working with a therapist or simply Google different relaxation and mindfulness techniques that don't involve the needing of another human or another substance.