Think carefully before securing other debts against your home. Your home may be repossesed if you do not keep up repayments on a mortgage or any debt secured on it. Typical APR 8.5%, 66% of customers get this rate or better.
When you are young you need to live your life now. Loans for 18 year olds are not impossible to get but your need to build your credit profile up first. This allows the lender to judge the risk of lending you money.