Op, you are protecting what might happen, rather than what has happened, based on what you see.
I am... or was... a very tactile person at work. I would hug everyone, until I came across a woman, who was lovely. We really got on. For whatever reason one day I just went in for the hug. Oh my gosh. The horror, she froze, then backed off. She simply explained to me, calmly, she didn't do hugs, or physical contact.
It was surprising to me, but after that, I always have her space and respected it!
People are understanding, a simple "im not comfortable with that" will be sufficient, there really is no need for "hugs" at work - I was a good deal younger than I am now, and would likely never do it now!
The photograph thing, I know you don't want to hear this, but you might have to suck that one up, you can certainly let them know, you're not comfortable and you rather not, and they might be OK with this, but part of my job was to have a photograph of me displayed, with my name and occupation so people knew who I was.
There wasn't an opt out version. You might hate it, but its part of work, unfortunately, and its not going to hurt you or scar you to have one photo for whatever reason, and then be clear you don't want photos taken unnecessarily.
As for social situations outside of work, a "no, thank you" is simple and easy enough.
"I'm busy" "not my scene" whatever.
Eventually people get the picture. I had a colleague who was liked at work, but never ever, ever came to any social stuff arranged by work. We would ask, but always the same answer. No. I understand now she had no interest in being around her colleagues outside of work. Absolutely a none issue, and on the nights out, nobody would be thinking of her anyway.
Tbh, she was wise not to come. They would just turn out to be people embarrassing thierselves, copping off with someone, or bitching. I wouldnt go now either.
....either way op, please stop getting yourself wound up before you've even started. You're worrying about things that haven't even happened yet.
Start the lovely job, being positive, happy, everything you say you are, and put your boundaries down as and when you need too.
Youre getting in your head before you even have too! You'll be great.
I'm guessing you were interviewed for the job, and obviously impressed them to be given your lovely job, so obviously, you're not that weird, awkward and terrible!