what the meaning of"I'm not sure I am up for this"

what the meaning of"I'm not sure I am up for this" I'm not sure about the meaning of the word .can i use your _ I'm not sure what I can buy for my mother.I'm not sure _____ what is the Chinese meaning of " i am beat." What are your plans for the weekend?I am not sure.____ Cool, This is the last thing I am not sure about. what't your plan for the May Day holiday,Tom? I'm not sure.I what is the c＿ of an ipad i am not sure .maybe I am not sure what the ____ of your story is.(hope/first/lif I'm sure I am not wrong Here I am waiting for you.I'm not give up because of our pro 求翻译"I don't know the meaning of the word 'fear.' – I'm sure