Gypsy,
It is almost impossible to keep your privacy safe nowadays. But one can make it a bit difficult by using separate phone number and email ID for different purposes and not to mix the same. You can minimize the exposure to public what needs to be private.
Using 2 different phones is better – 1st a 'smart' phone for internet plus Truecaller/gmail/whatsapp/facebook etc. all fully public which you can't avoid even if you never visit those sites or use the apps. Your profile will be built 2nd hand by others in your contact list, so you may want to choose if you should use your actual birthday/full legal name/PAN number etc for verification purpose by Google or Microsoft etc. Here it is very important NOT to do any financial use with any app given freely by social networks and banks and payment sites.
If you invite someone for an occasion, call their number directly instead of writing on their facebook page (or even chat private). It is possible to live off the social network sites and be happy. Tell your friends and relatives to not tag you anywhere or greet you for your birthday online – ask to do it direct phone (may not work).
The 2nd phone, even an ordinary basic phone, is for phone calls and sms only, no internet and no apps of any kind. Create a 2nd email id which you access only by going to internet by typing gmail.com on the address bar. This can be used only for your bank account, online bills and tax and legal purposes only. Not to be used to call/email a friend or relative for any purpose, in fact it need not be known to anyone who does not need to know. It just takes one call/email to a social networked person to lose privacy of this number.
Keep on the contact list only those numbers from the bank, service provider, tax man, etc. Do not answer any other call even if you feel deep pangs of guilt stabbing your internet-conscience.
It used to be that the email addresses stayed on its own. Now these are made into google or hotmail/outlook accounts by default. Hotmail or outlook.com IDs are automatically linked to Skype. All these are kept in "available" status until you change each item manually to offline.
It is one thing for our own country to keep track of citizens. It is a completely different and bad thing when other countries are tracking you and profiting from selling your info. So make it difficult for those folks by using God-given sense and choice.