Re: every failure makes you strong but why…
“I don’t know how to handle them… rite now i am working on my career… … i am trying my level best 
”
Remember - it is theh PROCESS that is important. The key here is you are a) working on your career and b) you are trying your level best.
As long as you continue this, you are following the correct PROCESS. It is a matter of time before success comes your way. Inshallah!