Sorry to hear you're struggling, I felt very very similar in pre-clinical years (I was in a lecture based uni but to be honest the lecturers just did not explain much). I don't think it's a realistic advice to transfer universities. What you need to do is find the ways to learn and understand the content that works for you and then try to suspend your frustration and just stick with it for a little while. You might find that things will gradually improve over time.
It is very individual but what I found is that some online resources, especially US-focused, can explain stuff really well, just as well (and actually much better) as face to face lecturers. The ones I found particularly helpful (just as a few examples) were AK Lectures on youtube - I used it for biochem but I think that guy has now created videos for loads of topics and he also has a dedicated website, all the content was free last time I checked. He explains from first principles, in a lot of detail, in a way that I found quite systematic.
Another great resource is Pathoma for pathology content but that one you have to pay for (but that guy might be one of the world's best lecturers in medicine, US medical students absolutely worship him). For clinical years Osmosis and Armando Hasudungan on youtube were consistently good quality, and Armando does a lot of videos on basic sciences as well, so definitely check him out.
I don't have a physiology recommendation from the top of my head as it was relatively better taught for us but try googling what resources people recommend for physiology for USMLE prep, there are usually many good recommendations there.
I would probably recommend sticking to the same resources once you find they suit you and not try to boil the ocean with multiple videos / textbooks for the same topic. This can be tricky though as your curriculum might not fully align with a single external source.
In general, sending sympathies again but honestly, it's completely normal and common to feel "what the HECK is going on?" while studying medicine and then slowly and gradually, will lots of hard work, things start falling into place. I am currently at the stage of sitting postgraduate exams (MRCP) and it's still a similar emotional rollercoaster. You get used to it over time though and don't panic as much any more.
You've worked so hard to get to where you are now, don't give up just yet, keep kicking, you can do this xx