Too many obstacles all at once can be overwhelming.
You've identified 3 main areas of stress:-
Finance
Cultural challenges (your age and the university environment)
Academic challenges
In addition (and related to the cultural challenge of your age and the unfamiliarity of the university environment) you identify a lack of emotional support.
So ...
Take them one by one. Accept that they really ARE a challenge, that they make you anxious.
Then try and tackle them ... separately ... and CONGRTULATE yourself for every step forward you make.
Loneliness, brought about by being different from the average student, is a big deal. Dammit, it makes you a vulnerable student, at risk of dropping out.
You feel like an alien and lack the support networks of other students. Not only do you miss the really important informal emotional support, you miss the informal networks of academic support friendship groups provide.
This matters.
You should flag it up with a tutor and also take a real deep breath and try and make some friends. See it as a module on the course.
Finance - that really matters. Get someone to help you with the form. Explain you have so many disparate area of stress you are feeling imobilised. Get help. It's there - call on it.
Academic - it WILL come. You're rusty AND you're stressed, suffering from cognitive overload. You're dealing with analysing and negotiating an unfamiliar setting, you feel threatened because the lack of familiarity makes you feel vulnerable. Of course you can't give a full, calm attention to the academic side!!
But it WILL come.
Short-term, take a deep breath and, in a lactate, when reading, take a minute to allow yourself to BE INTERESTED. You did this course because you were interested. It hasn't changed. It's still interesting. What's changed is that you're too stressed to be happy.
But you deserve to be. You deserve to enjoy this.
It sounds mad but you need to remind yourself of this.