I'm 22. I've had noticeable anxiety since I was about 14 or 15, and for about a year prior to that I was very depressed. I don't think I was completely healthy as a kid either, but my teens were when things got much worse and I started recognizing it. My anxiety started off with disassociation and frequent, severe panic attacks and the beginnings of many phobias. I also had pronounced health anxiety and pretty severe ocd symptoms. Right now I have agoraphobia/avoidant behavior, various phobias, more manageable/mild ocd symptoms (mostly hypervigilance now but still some counting type symptoms), some health/medical anxiety, disassociation, panic attacks, social anxiety, etc. I've become very good at hiding my symptoms from others, even during a panic attack, but really I just feel awful. Oh, and I've also struggled with intrusive thoughts.
I understand my anxiety more then before, but it still impairs me just as much, just in slightly different ways now.