im 21 and without social network?

You need food, shelter and clothing. 

I suggest that you get a job to pay for those basic needs.

Social Network is optional.

I cannot understand this fascination people have with 'networking'. This is the closest I will go to 'networking' - and I choose anonymous. Why do people want total strangers to see what they're doing/what they possess? Just like this site - you don't know what is real and what is set up. And then you have the trolls who are jealous and nasty about everything and want to 'share/judge'. Life is short enough without inviting them into your life! There are some great games you can play on line - and some are quite addictive. Dare I suggest? There's some really good books out there as well . . .  

Of course you will survive,  Try network connections.

You will survive.It is not bad at all if you have not a profile on any kind of social network.

I swear there are trolls in every section of Yahoo Answers.

That ok..................