If you can't really feel attached to anything or can't even feel anything (basically speaking lost almost lost all of your emotional stamina), how would you walk through live? when you know people are just gonna come and go, the cycle keeps repeating itself over and over, and these people may not even appreciate you, how can you walk through it?

Speaking seriously in an overarching way:
You center your life and value around your clearly stated personal goals (education, work, art, etc) instead of your subjective interactions with other people. That's how I keep going, anyway.

The ability to feel will come back when your subconscious thinks you're ready to handle it again, or when you get bored. Depends on the person.

Speaking less seriously in a more relevant way:
Just stop dating / dealing with overly emotional people in general for a little while. You'll get over it soon enough.

Well, I learn. Doesn't seem like you do though, your English is horrendous.