Difficult day

I've been somewhere today that made me very anxious, if I hadn't had my support worker with me I wouldn't have gone in. I'd never been inside the building before so this made me anxious, then the room was full of people, this made me more anxious, I couldn't speak to anyone or look at them, I couldn't focus because all the noise around me was getting too much. I did manage to speak to 1 person because it was about a special interest I have. But it's left me feeling a little down, people think I'm fine because I can function well in familiar surroundings but then today has shown me I'm not doing well at all in social situations or in unfamiliar places. I do the same things and go to the same places. I'm not happy unless I'm doing my usual things. Do others feel a bit low when a day you've had makes you realise how hard and stressful things can be