but I only count one person as a true friend in whom I can confide my personal struggles.
For me, I wouldn't even share my struggles with my best friend. It's hard to explain exactly why that is, but I don't think I could do it. Some things it would be easier to tell a random stranger at a bar... maybe because they don't have any expectations of you, and you don't have to worry about a feeling of letting them down, or disappointing them or whatever.
Having to maintain a never-ending facade of success and happiness really is draining.
Psychological breakdown lies down that road. You can only kick the can down the road, but you can't make it go away by ignoring it. Your choices are 1) talk things through with someone now 2) struggle for a while and talk to someone later 3) burn out. The first two choices are the same, except that in one of them you get to struggle before arriving at the same end.