Many of my CS school mates at university took algorithms more than once. Some dropped it, some failed it. That class was the reason many CS students dropped out

Many of my CS school mates at university took algorithms more than once. Some dropped it, some failed it. That class was the reason many CS students dropped out or changed majors. So, don't feel like it is just you. It's something people can learn, but it takes a lot of practice to do well. You should have a leg up on most as you've already done Maths.