Other ways of building confidence ?

make a list of positive attributes and repeat them out loud
bob is good at math
and do it every day

 

Boosting confidence? I find pushing some sort of limit is best.

E.g. exercising (running is a bit too tame; sprints, weights, or calisthenics is better to actually reach a physical limit..just don't break anything).

Or you could take the intellectual route, and read some challenging books, like quantum biology or something.

Or, if you are a tinkerer, build the coolest shit out of scrap that you can.

Basically, do something simultaneously productive and limit pushing.

 

perpetual motion
tesla
aether
firmament