I'm a single mum to an 8 year old girl. She's at her dads this weekend from Friday until tomorrow morning. I was out on Friday night with friends then caught up with a few friends yesterday and went a walk and for coffee and then just chilled last night. This morning I gave my friend a lift to the airport, then went to another's for coffee and was there for about 3 hours.
I nipped past the shop on way home and got a bottle of wine but I feel really guilty for doing it for some reason. Drinking alone on a Sunday afternoon, I feel as if I'm doing something sneaky. I just want to get a bit tipsy and watch a film and will then have my dinner later but I just feel as if I'm doing something I shouldn't be 
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AIBU to feel guilty or as if I'm doing something wrong cracking open some wine at this time on a Sunday or is it perfectly reasonable?