Hmmm, I probably could have posted that op myself. I can’t stand a lot of people, either, and I’m also on meds and in therapy. “Mean Mary_Ellen” comes out when people are too slow, too fast, act superior, act stupid, are too happy or chipper, make little mistakes or just irritate me for any number of other reasons. It’s why I don’t socialize with a whole lot of people - most of them drive me nuts. I have a very, very small number of friends because, for one reason, I don’t like how I feel when I’m with most people.
Sure, I’m working on this with my counselor but I also bring this to confession as I know some of it stems from my pride, perfectionism, and lack of humility and charity. I hold myself to very high standards and I expect other people to meet those standards, as well. When I fail - I’m hard on myself. When others fail - I, too, want to bonk 'em on the head or just further isolate myself from them so I don’t have to deal with them.
My advice to the OP is to ease up on others and on yourself. Pray for those who cross your path. If you don’t remember to pray when they’re in front of you, pray for them in the morning (“bless all those I will meet today”) or at night when you review your day ('those who I have met today") and ask God to help you see others as He sees them. Pray for humility, that you will come to truly know that you are not “better than everyone else” but that you are actually called to be a servant to all you meet. I frequently pray the Litany of Humility and I share it with you here, below.
Remember that while your illness may be a factor in how you are reacting to people there may be an element of sinfulness involved, too. It can be hard to figure out where the line is that divides the two. I bring specific situations and attitudes to Confession. When I’m confused about a particular episode I may mention “I’m not sure how much of such-and-such was due to my mental illness or to my own sinfulness.” I figure if the priest wants more details than that - he can ask. I have found that the graces found in frequent Confession have been very helpful in overcoming this basic bad attitude that I carry around with me.
Be at peace.
Litany of Humility
O Jesus! meek and humble of heart, hear me.
From the desire of being esteemed …
… deliver me, Jesus.
From the desire of being loved…
From the desire of being extolled …
From the desire of being honored …
From the desire of being praised …
From the desire of being preferred to others…
From the desire of being consulted …
From the desire of being approved …
From the fear of being humiliated …
From the fear of being despised…
From the fear of being rebuked …
From the fear of being calumniated …
From the fear of being forgotten …
From the fear of being ridiculed …
From the fear of being wronged …
From the fear of being suspected …
That others may be loved more than I,
… Jesus, grant me the grace to desire it.
That others may be esteemed more than I …
That, in the opinion of the world,
others may increase and I may decrease …
That others may be chosen and I set aside …
That others may be praised and I unnoticed …
That others may be preferred to me in everything…
That others may become holier than I, provided that I may become as holy as I should…