Simple is harder than it looks

So, my cousin asked me to drop by (only 6 blocks away) today.  She is working from home and we could have had lunch.  But I was anxious about running into L my cleaning lady and having to pretend to be "normal."  A friend said he'd like to take me for a walk at 4:30.  I feel like I should go and get out of the house since I haven't today, but the time is getting closer, and I don't know if I can do it. I already feel bad that I didn't go over to my cousin's for lunch.  And I know I will feel worse if I don't go for a walk with my friend. I can't figure out why I am getting anxious about something that "should" be so simple.  If it were someone else, I'd say, "Go for a walk!  The fresh air will do you good."  Or something like that.  I know what I "should" do but I have such a hard time with doing what I "should."  Especially lately. I feel like if I say it out "loud" maybe I can figure out a way to deal/cope with it.  Maybe it won't seem so big....