lost-mines-of-phandelver is impossible and for a starter kit is putting our group of new players off [on hold]

So fare there is no introduction in the game play itself to the underlying rules expectations of characters in order to succeed. All the enemy’s are so over powered we just keep dying and achieving nothing. As an introduction to D&D it is not doing to well.

Are we missing something, as it seems like if you are not in the know already do not bother trying as it is a closed club.