'Myself' in the Bible

I undertook great works, building myself houses and planting vine-gardens.

I made myself gardens and fruit gardens, planting in them fruit-trees of all sorts.

It is one who is by himself, without a second, and without son or brother; but there is no end to all his work, and he has never enough of wealth. For whom, then, am I working and keeping myself from pleasure? This again is to no purpose, and a bitter work.