We want to come to a game but need to stay overnight in St. Louis. We cannot find a hotel that will allow us to check in because we are 19 and 20 yrs. old. Do you have any suggestions?

check in Collinsville IL. not sure about rules but be easier traffic than going out to West County

Check Fairview Heights Illinois. Then you can catch the Red Bird express from the mall for 5 bucks.

get credit card

Not really, maybe try a BnB instead.

Most of the hotels downtown will have those rules, check in St Peter's or Maryland Heights.