I have no friends but i still want to use facebook?

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I have literally no friends in my life. I've recently transferred schools and today was my second day. A guy from my history class asked for my facebook, twitter or instagram and I told him that I had none of those, which was true, cause I have no friends at all so I didn't need a social networking account. Today I made a facebook and made my friendlist hidden. I've only posted once on my wall which is ''Can't remember the password of my old fb acc '' and shared a video from vine, and I uploaded a new cover photo which also appeared on my wall.

Currently I have no friends on facebook. I'm thinking of adding my current classmates on facebook if they ask which will most likely happen, because in my old school when I had no friends, 80% of them have asked for my facebook and I felt like a loser ever single time I said ''no.''

I am having second thoughts on this though, because I won't be posting anything about my life. At most I will only be ''liking'' theirs and other people stuff and sharing them and I won't post a comment. Plus, I'm too shy to upload my selfies so I have no photos at all. i want to start using fb cos i MISS MY OLD CLASSMATES so badly. They weren't close enough with me to be considered friends but for once in my entire life they were the closest to being my ''friends''. they tried making friends with me but my extreme shyness made it difficult. they were so funny, awesome and unique

so should i add them and my current classmates on fb?