We all ,to some extent ,have too many wishes to filfull,despite the fact that success sometimes is beyond our reach.So we inevitablly feel down,regretting the false move we have taken.But I don't think it a good idea to place too much attention on success.The most valuable thing life has to offer us is to enjoy our life even if you have never succeeded.We are humans,not goods,and we cannot be measured by money.Without money life is sometimes hard but that does not mean you should put on an abject air.
We came to this planet not to suffer,but to enjoy.We are lucky in that we have been so far the only living things on the planet that can think. Like animals,we may suffer a lot from hungry,horror and the like.But we can device to improve the living environment and adapt ourselves to it.