I don't think it's about suicide. I think the jumping off a cliff bit is about how our lifetimes are like jumping off a cliff because we "never know when I hit the ground" ie die., and there's no way of stopping it or slowing down time. You can either be terrified of hitting the ground (death) or enjoy the exhilaration of falling (life) and he's saying he chooses to enjoy it.
I don't think it's about suicide. I think the jumping off a cliff bit is about how our lifetimes are like jumping off a cliff because we "never know when I hit the ground" ie die., and there's no way of stopping it or slowing down time. You can either be terrified of hitting the ground (death) or enjoy the exhilaration of falling (life) and he's saying he chooses to enjoy it.