I have failed many times in life in all aspects.
But I am happy that it has given me some learnings.
Yes, it has given me bitterness at heart, disillusionment, and cynicism - which may drag me down. But all of this is hugely compensated by having that one realization - that to be truly successful in the long run (and which means truly happy), one has to be a good, kind human being - sincerely care about the people around you and love unconditionally. The greatest gift of God is the gift of love.
I am still way far from putting this into action, from being such a person - but at least realization is the first step.