Also agree to find a few friends if possible to rides with. The MUPs are usually frequented by the slower riders, so you might find some slower groups there that meet regularly.

Although it can be very rewarding to organize and lead a ride, it can also be a PITA. If a group is all at the same pace there are fewer problems, but there will likely be a variety of levels of the riders, which make it tough to blend. As the leader you will get your ear chewed on, but some enjoy organizing events.

There are very likely many riders in your area in the same situation as you. Keep searching, consider some of the suggestions mentioned, and keep riding solo until you find them. Not everyone wants to go "fast", they just want to go faster.