Am I too skinny? Pics

Im 18 and Ive never thought that way before.. I have always liked the way I looked and accepted myself. Yesterday though my teacher mentioned it seriusly and asked me if I had a problem and would like some help. I have been asked this a lot before but it was just a random question like "do u have any eating disorder?" and I would just say no, this time however he said that he was talking about it to his collegues and I felt uncertain about it. Do I really look that bad?

FYI tho I am very healthy and so does my blood test say. I eat regularly and every thing is okay.

Im 180cm abt 5ft10 and 58kg (dont know how much lbs)

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