Actually a poor comparison the C150/2 is very much stronger than the 737 or any other heavy commerical aircraft. The design codes for light aircraft specify very much G levels.
And remember the airbus where quick rudder reversal removed the fin?
Back to the plot as far as spinning - the C150/2 is one of the safest of the trainers to spin, it will almost recover by itself and using a variety of methods - something which a number of trainers simply will not permit. So check the aircraft is in decent condition and go and enjoy it.