I suspect it's a combination of your seat adjusted too high and your handlebars adjusted too low.
Come to class a little early next time and ask your instructor to set your seat height and remember the setting. This probably won't ever change for you.
Next have your instructor set your handlebars conservatively high. Riders will usually gradually adjust their bars lower and lower over a couple years or more. Initially it's a lot more comfortable overall to start with your bars pretty high.
Once you have your bike setup correct you probably won't need a gel seat.
Have fun,
Rex
Excuse me... May I motivate you?