People between 600 -700 play like 1200!!!

I play like 40 unrated games yesterday I notice that people between 600 - 700 supposedly beginner are not really. Openings, middle games, perfect. 

Yes. People who play a lot of unrated games often have wildly inaccurate ratings.

That's why you should play more rated games.

It is possible that your own 734 rapid rating is off by several hundred points. Your current ratings are based on only 39 rated games for all time controls. (And 276 unrated games)

If you played rated games, you would be more likely to find a rating where you win about as many games as you lose. After all, that is the point of ratings-- to help you find good opponents.

Yeah I get the purpose of rating but I'm actually playing Unrated games because I can find people over 1800 which is unlikely to happen with my real level.

I like to play against strong folks , it's just funny that so many 700 worth way more on casual games.

But you'd don't gain anything form playing over 1800. Yes, you learn from stronger opponents, but not in case when you lose no matter what you play and you don't even know why. (if goal is improvement)

There is no real lost in chess, especially if you play strong opponent. You can only improve by playing better opponent, for me at least.