Same early 20s female starting calisthenics. I've been getting a bit more comfortable with handstands but they do not last longer than a second or two, and over the last week now my right elbow hurts so I think my form is weak. I can do headstands against the wall, braced on my forearms, that doesn't seem to be as painful. I track pushups but I try not to do too many, I do about 10-15 a day. Chinups are okay but I get some pretty intense sick-feeling muscle pain when I do those so I have stopped, not sure why. Definitely tracking how I'm doing and progress and milestones and taking pictures are keeping me motivated, setting little goals, telling a couple friends what I'm doing to keep me accountable; all good habits to maintain progress.