Lost, please advise

You dont give much information tbh, but you dont seem to have good options at home.

You need to deal with the loneliness issue first because thats what makes you feel unhappy and is clouding all your decisions.

Then you can decide whether to continue your studies or seek a transfer to a different course. You seem to be on a course you dont enjoy and which you have little clue about what sort of career you might do.

If you are good enough then a science degree is more practical, but check with careers about possible jobs you could do. The importnat thing is to be able to get a good class of degree and you stand most chance to get that if you like the subject.

To do a science degree then they may well make you start the course new.

I wouldnt commit to a degree until I knew its what I wanted. Its too expensive a choice. You cna alwats come back later if its what you want and you have dealt with how to tackle the loneliness.

Yes, I can feel tired and lonely because there is no one to rely on. I don't know what to do about this, I tried everything. There is no one there for me like a family to advise, care, etc. You can say "don't throw your life away" but otherwise these feelings get too much. I am on the verge of leaving things sometimes. Even psychologists don't help in this way. Because it doesn't look like it will get better (in fact it increases with time and effort), I feel like I should leave things.