Understood. Just to dispell a couple of misconceptions first...
A Computer Science degree wouldn't have negated the need to interact with users, testers, business analysts, project managers etc. Most software developers are not isolated creatures.
Similarly, I'm not sure you'd find many projects managers who would describe their career as "relatively chill/less stressful". They have to handle changing requirements, budgets, deadlines, etc. - often with limited resources at their disposal.
The reason I asked what you would do if you were to volunteer was try to and avoid the focus on a career, which can be a little suffocating. Trying to decide now want you want to do for the next forty years or more is slightly nonsensical. These days, many people don't stick with a single career anyway.
It seems to me (as a non expert - and I can't stress that strongly enough!) that your social anxiety is really getting in the way. It's already stopping you doing want you'd want to do ("something with kids like maybe volunteering in a kids hospital ward or working with women e.g at a shelter or something") and is pushing you towards things you don't really enjoy ("having to work with people makes it harder for me, It’s one of the reasons I picked computer science).
I assume you realise that "something in politics/law" is likely to involve interacting with people? (To be honest, unless you fancy manning a remote lighthouse, you're going to end up interacting with people whatever you do.) Is politics/law sufficiently interesting that your desire to do it might allow you to keep your social anxiety at bay somewhat?
Are you thinking of potentially returning to uni? (Third time lucky!) From what you've said above, you're unlikely get much in terms of a loan (it's likely that only your final year would be covered). Is that likely to be an issue for you, as it would be for most people?