I am getting rekt in linear algebra right now. Give me all of your resources and tell me what I should do.
But seriously, I don't know what to tell you besides work through problems, watch lectures online, etc. There are plenty of youtube lectures and sometimes a second perspective is what helps someone learn. Linear algebra is immensely useful and applicable, so it's worth learning well if you plan to continue in STEM.
Nobody cares if you passed linear algebra last semester and you now have a godlike understanding of math and the universe. A matrix is a map and has a kernel which is the same as its null-space.