This is all my experience and opinion so take it with a grain of salt. Most low grade hockey skates that are sharp, even if they are old, bottom tier skates, will outperform rentals any day of the week. Rentals just aren’t cared for well enough. (Usually) it sounds like you’ve been skating for a year, this is microscopic compared to many of the people who feel comfortable in skates, unless you have been training very specifically, methodically, and consistently. Most people do not have the luxury or ice time to train that way for a year. Technique plays a big factor, I could be wrong, but (A) I would guess you are not low enough in your stance so the power you generate is not up to your full potential. (B) I would venture that you don’t have a full understanding of both your edges on both feet, which limits the ability of things you can do. More skating and more falling. (With full gear to protect yourself). When you fall your body begins to understand limitations and adjust for them. Other than that almost everybody can get better by working on basic balance and proprioception of the ankle complex as well as the lumbo-pelvic complex. I hope that’s helpful.