My mum just told me she doesnt want me to leave the house because she can't stand the idea of me getting sick

It's an understandable concern but you simply have to leave the house, as do the vast majority of us. So you mitigate the risk with reasonable levels of caution and common sense. You also take into account that the odds of catching it are still lower than the odds of not catching it and the odds of dying from it are massively lower than not.