well, i'm really not sure what Medalia means by "getting in over your head", but if you feel you'd like a bit more of a challenge, perhaps you could try talking with your instructor a bit. begin by asking yourself a few questions, though. are you comfortable with your riding at the moment? do you feel that you need more experience or confidence in the saddle before you try something new (say, for example, more specific western-type events, some trail riding, or perhaps moving to English)? what are your goals? it sounds like you really enjoy riding, but perhaps you want more out of it than just being around horses and knowing how to ride (there are lots of people who do just that and are perfectly happy). after i had been riding a while, i already knew that i absolutely loved it and wanted to set some goals for myself. one of those goals was to get my riding to the point where i could lease a horse a begin learning dressage. i'm now doing that, and it's great.
so... do a bit of reading, think of some things you'd like to do, or perhaps even some simple, more generalized goals (eg, "i want to be able to sit to the canter like i was born in the saddle", or something) and talk it over with your instructor (if he/she is the "talking type", of course!). perhaps there is a more advanced group lesson he or she could put you in, or perhaps you could do some more advanced stuff individually. think about trying English riding, as well - not that there aren't a great many Western events (i don't know too much about them, but i know they exist!), but within the English realm of things, there seem to be a greater number of "disciplines" - hunt seat, jumping, dressage, cross-country, endurance, even competitive trail riding (which you can also do in a western saddle).