I want to thank everyone for your great advice. My lesson today was a success! I did shorten my stirrups one notch (they were too long anyway, way lower than my ankle bone) and that helped me feel more anchored and made it easier to stretch my heels down.
I did the "baby" crossrails at the trot, and I stayed up and secured over both jumps. I stretched my calves down to my ankles, dropped my hands down and grabbed the mane, kept saying "just stay up, just stay up" and let the horse come up to me. I did fall forward a bit the first time but after that, I did great. Summer (my lesson horse) would canter after the first crossrail and that was not a problem. I actually liked the burst of energy!
So thank you all for your wise words! You all helped me tremendously. I feel much more secure and confident In the saddle :)
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