Dear Riya,
"The only reason people talk behind your back is because you're already ahead of them."
"No one can hurt you without your permission"
Somewhere in their heart they know (or maybe they don't know) that you are a better person, but they still try to speak of your weakness or negative things so as to get attention or following, of people who are also jealous of you or your achievements; or of the people who also hate you. There will always be the persons who will hate you or be jealous of you, no matter how great or good you are.
Before All this – Ask yourself – Is it really worth it? It’s got to make sense now! If it doesn't, it’s not worth fighting with such people. It’s not easy to just let somebody put you down. Don’t take it if you think the person is not worth it. But you won’t know who is worth it and who isn’t until you try.
So try talking it out with them and if doesn't work out, remember the first rule, you don’t have to waste your time and energy thinking about what worthless people think about you! But trying to sort it will save you from regretting it later. You’ll have the satisfaction that you did your bit to clear the problem.
Question the loyalty of the person who tells you someone is talking behind your back. And why is he / she so concerned about you ? Can you trust this person ?
Walk it off. Go home, take a bath, listen to relaxing music, turn off your phone, and take a nap.
Best reaction is Not to react at all. They will do for sometime and when they do not see any reactions they will move on.
You can see one of my answers on Quora that will help you find a solution to all your problems
https://www.quora.com/What-psycholog...__filter__=all
Cheer Up !