Sagar_12345, i agree with Jake-SonyXperiaSupport, u can try My Xperia, but Jake-SonyXperiaSupport forgot to say, that My Xperia already must be activated manually. I never did not saw that My Xperia was activaded automatic. But maybe possible without that to locate device. So if u didn't that, i don't thing that My Xperia helps u. But is another way to locate your mobile if u did not changed any settings. How many time i repaired or updated Xperia devices, even last years, i mentioned that in Google Settings app is checked security settings like activated. It's mean that u can try to locate it now. About Android Device Manager u can find here https://www.google.com/android/devicemanager, need to log in into Google Account. By the way appg u can download from Google Play https://play.google.com/store/apps/details?id=com.google.android.apps.adm&hl=en and find a little bit information about it or read more here https://support.google.com/accounts/answer/6160491?hl=en. Good luck, i hope it helps u 
p.s. don't forget if u have any one of popular antivirus apps like Avg (For Xperia was installed in my C5 Ultra Dual, i just activaded it), Kaspersky, Eset, Panda or any others popular antivirus and if u activated it, all features (even ati-thief feature), u can locate in yrs antivirus internet page too
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