People are missing the point on the minion mechanic
Yes the minions on the winning team will push to your tower. On the brightside, that means you can basically farm under tower forever and ask your jungle for ganks.
Anyways, to be 3 levels behind, you must be incredibly behind, and you should be grateful that the minion will come under your tower and the enemy laner wont just freeze it where he can kill you if you come to cs.