As long as you keep showing up, you keep learning. I spent a year and a half doing social rides at 12-14 mph. Then my more experienced friends began teaching me to paceline. Drafting is a hoot but it took me a while to get comfortable riding so close at speeds over 20. This is the only sport I've ever been involved in where the goal is for your friends to run off and leave you. I can hang longer than I could last year but I'm still learning to ride smarter. Yesterday I tried to spin at a higher cadence (90 to 100rpm) and burned myself up after about 20 miles, finished with 41 miles but I pretty much crawled home.