That's the process one goes through to become more secure. Being secure is not the same as being stable. It's being comfortable with changing, with challenging and being challenged. It's a life long process.

Being insecure is completely normal. It has nothing to do with your age. Your insecurity is a reflection that you're living in denial. Try accepting all part of yourself, be it good, bad or ugly. Acceptance will help you evolve and change in a better way. If something is in your hands you can definitely change it and if not then why to worry, just accept it as it is. Try simplyfying things rather than complicating it. Just go through this phase and you'll yourself will learn and evolve.

Change how u perceive things and people around you. There’s hell no way you can change people. No matter where you go, people are always going to judge at some level. Absorb what works best for you in terms of growth both physically and emotionally from people and ignore the rest.