For example, for a 25 year mortgage, on a 100k property (very cheap these days), at 6%, then your monthly repayments will be £644 - of which £500 is pure interest. So, only 22% of what you pay will actually go towards building up your equity.
Could you explain your numbers a bit better please, it does not make sense that if you have a 6% rate on a mortgage that only 22% of what you pay is actually going to the equity of the home and the rest is going to bank interest.