A set back

The past two weekends I've a little much to drink and I have mixed beer and wine. I'm glad I've kept my goal of not drinking liquor, but I'm disappointed that I've mixed and that it makes me act childish sometimes. I want to really take this seriously and not mix different types of alcohol. I also want to be able to stay sober, and fight that urge to keep drinking when I know I should stop.Why is it so bad to stay sober? Why do I get that feeling that I should be drunk to have more fun?