I have such happy memories of performing in a choir and I don't think I'd have got where I am today without all that experience. So my advice to young singers is to either join your school or church's choir or find one in your local area. Choral music at any level teaches you so much about musicianship and blending your voice.
All the times being like 'Who rented this car and why are we going to this place?' You take the easy route and go 'Oh thanks for the champagne. I'll have another.'