Cessna 182 pilot reported encountering wake turbulence from several B737 aircraft overflying his track. ATC reportedly refused his request for a lower altitude into ORD Class B airspace to avoid the wake encounters.

Narrative

Departed ZZZ with IFR flight plan to GYY with destination of C77. Cancelled IFR with South Bend Approach due to no access to Chicago Class B airspace for GA flights. Climbed to 10.5 to go over top of Chicago Class B and approaching Lake Michigan requested VFR flight following to remain within gliding distance of the shoreline. Shortly thereafter was vectored by ATC to turn further north whereby I advised ATC this was beyond gliding distance to shore. As a condition of continued ATC flight following services I had to accept the turn or services would be terminated. So continued the flight out of gliding distance of the shoreline for approximately 7 minutes while asking for easterly turn toward the shoreline. Floatation/lifevest on board does not make this a safe or acceptable practice.Proceeded over the top of Chicago Class B at 10.5 navigating direct to C77 Poplar Grove and three 737s at 11000 caused wake turbulence advisories to be issued by ATC. After flying through the first wake I requested descent and with no traffic below/ahead ATC refused the descent approval to enter the Chicago Class B. Continued through wake of 2nd 737 however avoided the 3rd 737. My flight was trapped between the top of the Class B at 10;000 ft. and heavy traffic at 11;000 ft. resulting in an unsafe condition with no clear solution.Chicago ATC practice is to exclude GA aircraft from Class B access as a standard practice even though no published policy exists in the TRACON facility manual. This exclusion of GA aircraft from Class B access created the above unsafe flight operations for this flight and creates unnecessary risk for GA aircraft operations daily.A survey I took of GA pilots in the Chicago area found the above over water and wake turbulence exposure risks occur on occasion. Please use this report as the basis to begin creation of solutions to the above issues.