Raising 3xBB after 4 limpers is a sure way to have the action go 4-5 way on the flop and just asking to have your aces cracked. Preflop like everyone said make it $1.50-2, and bet 3/4 - full pot on the flop, then all in by the turn. Your flop raise is ugly. You don't give bad odds to drawers and you are just begging to get pushed off your hand. As played I would call the turn.