From Algebra till love affairs. Who Am I?

Tables, shelves and chairs. Maybe we don't always have dates.
You can find a lot in me, from Algebra till love affairs.
Helpful I stand out there, but helplessly you fade away. well, I could
show incredible things, you just come and guess who I am.
Encyclopedia, no, I'm not. I'm all the words which you can't read all.
So proudly my name starts with S and ends with Y.

I hope you know me now!

In my opinion, it is better to know yourself than you hope the other know you.

I am who I am.
You are who you are.

Greetings! @ danielwong
What i wrote wasn't about me at all !!
It's just kind of a guess , i wrote some details about something then, you should have know (guess) what is it ?
The answer is: Library .
Anyway... thanks for your comment :)

Best Wishes !