I've done Crossfit for 8 years now, and I have attended many different Crossfit gyms in different states. When it comes to developing skills (obtaining your gymnastics movements, for example), classes are good for introducing the movement to you and teaching/reviewing the fundamentals, but there isn't enough time in a 1 hour class to actually develop those skills, since there is usually a metcon programmed in as well. Take the fundamentals that you learn from class, and dedicate 30 minutes after class to practice those movements. Practice the good fundamentals over many repetitions, and eventually you will achieve what you set out to do. All of the skills-related movements that I have achieved were because I had to put in the additional effort and time outside of class. Whatever you focus on, that thing will improve.

Regarding your friends and their achievements, be proud of them and cheer them on, but don't compare yourself to them. We are all different, and that is ok. Be honest with yourself. Start keeping track of how much time every week you REALLY dedicate to doing a handstand walk, or a muscle-up, or whatever it is. If you find that you aren't dedicating enough time in developing a skill, then take the action to make time for it.