Hi Sisi,
When adult life kicks in and gets stressful, it's normal to occasionally feel like we're not cut out for it. And that feeling certainly isn't limited to the ABDL community. Adult life can be very rewarding and it undoubtedly has its perks, but work, adult relationships, responsibilities etc. have pressures that most humans wish we could escape from sometimes.
There's nothing wrong with crying, in and of itself. We all need to let our emotions out sometimes, because there are points where life feels pretty grim and overwhelming. Provided you're not crying and getting upset all the time, I think everything you've described is fine. Every one of us would like to go through life being happy and feeling relaxed, but that's not the way the world or the human psyche works. There are peaks and troughs.
I suppose my only advice would be to not put too much emphasis on what these blips mean to you - provided they are blips, and that being sad and emotionally overwhelmed isn't your default setting (which would be a problem worth visiting a professional about).
For what it's worth, it's incredibly common to feel like you're playing a role in the adult world - whether in your professional life, personal life or just how you present yourself day-to-day. Again, that's not limited to ABDL. It's just a common struggle in adapting to the adult world, for most people.