Here's my view as somebody who really shouldn't be trusted with these things.
Think about the reasons for having life insurance for a mortgage. It's so if you die, the mortgage gets paid off and your dependents keep their house. So if you have children, it's definitely worth considering. If it's a joint mortgage with a partner, and they need to stay in the house in the unlikely event of you copping it, maybe. But if not, is there much point? The house gets sold, that pays off the mortgage. Also what's the chance of dying? At 19, should be very low - and the insurance cost really ought to reflect that.
What's rather more likely is staying alive and losing the ability to pay the mortgage - illness, accident, losing job, stuff like that. The premiums for that insurance are likely to be even higher than for life insurance though, and I took the risk instead.
(similar thoughts is why I never get to say yes to any PPI people, because I never took it out in the first place).