Yeah this is tough. When you have Aces and there are 7 people in the pot with you you'll likely get outdrawn. Scout out the table before you play and if it looks like you'll have little to no success pushing people out before the flop play really conservatively -- to the point where you are only calling the big blind even with premium hands.
Truthfully, this is only if you still think it is worthwhile to play at such a table. If you want my honest advice avoid this game completely
