After i started playing badminton my hip started paining and my legs too.i can't even walk properly in this situation.why is it happening?

Exercise and pain.: Please let your parents know if this is not resolving. Do your stretch your muscles before and after playing badminton? Are you in good physical shape? Are you a very physically active person usually? We can't answer that question with the available information. It would take an actual assessment to tell you the exact cause.