I am 51 and I'm still not sure if I'm an adult.
Are you talking with a therapist? If not, I suggest you do. Sometimes getting to the bottom of the inclination to depression, can really help. I have been on Citalopram and in therapy for over 2 years. I have made much progress and while I have dips in mood, I rarely get so low that I can't function.
Learning my triggers has been a great help. Good luck to you and welcome to the group