Hello. Your post resonated with me a lot, I'm male, 24 years old, looking good from outside, physically, mentally, I appear mentally better than others since I'm good with words and I have life experience, I have good body-built, I'm fit, everything looks I got things better than most people from OUTSIDE, but in the inside it's the same as you said. And if you ask me this situation makes our DP/DR anxiety cycle so much worse because we feel like we're not living up to our potentials and that kills us from the inside, we always know how people see us but we are unable to reach to that setpoint, and that creates depression and the sense of "failure". And seeing people perceive me as normal and me unable to experience any kind of taste of life kills me from inside. But I'm starting to use that as a motivation now.
If you ask me medications are dangerous gambit, I've used +30 antidepressants, antipsychotics. Because when you quit them(you do eventually), you will need another supplement to support you, which there are many supplements that can give you the same push as the medications, almost better than it, because there are many things without those nasty side effects that will make you obsessively think if this is caused by medication or not in the future.
These things I'll write might not appear as strong cures from outside, but when done regularly their effect gets cumulative and they are strong as fuck. They will really impact your mind in a good way. I would ask you if you ever tried one of these regularly with a good consistent routine: CBT, DBT, ACT, Yoga, Meditation, Hypno-Therapy, Having regular sex with someone trustworthy and likeable as a person. Journaling. Gratitude.
Humans are multi-faceted creatures, if we want healing, we need to work on all areas, relationships, friendships, inner world, external world, mind, body, apperance, ego care, soul care etc.