Take some time out! It sounds as though you are trying to be everything to everybody and are in danger of losing yourself!
Which of those things are important to you in you every day life - the most basic bit, earning a living so you can eat and live in a warm dry house? Ignore everything else and concentrate on getting those core things right, comfortable, doable!
All else, charity, lgbt, feminism etc, they are the sort of things you can only spend time on if your core needs are being satisfied.They are luxuries, if you will.
If you feel like an imposter and that teaching is not currently your string point figure out why? Have you tried to run before you can walk? Are you biting off more than you,and your students, can chew?
I used to mentor (well, more like 10 rounds of verbal MMA on a daily basis) a very cocky, arrogant young man. An NQT who knew absolutely bloody everything there was to know about everything. He made my working life an anxious misery, I have no idea what it was like inside his head!
He had a very slight grip on some topics and instead of parking them, getting me to teach them until he was comfortable with his string topics, could teach all the wizz bang wondrous stuff today's classroom requires, he fought tooth and nail to teach his weak topics and then blamed everyone else for his failing.
If you even suspect you may be doing one iota of that STOP IT and find a colleague you can do some team work with.
Don't let it burn you out... I speak from bitter experience!