Am I too skinny? still think I need to loose more..?

I'm 5'9 , 17 yr old male and weigh 134lbs..I would like to be 126.I've lost almost 100lbs in the last year though and have excess skin on my lower stomach which makes it look like i have fat there.. but my hip bones stick out a bit and my ribcage protrudes sometimes.. most of the time my face is a bit sunken in but I ate more yesterday and it's a little more filled out now. Also my legs are reasonably skinny (19.5inches) waist is 25.5inches, hips 32. My arms are the worst though, when I tense the bones stick out a little and that bothers me. my collarbones always protrudes as well and my wrists are skeletal.. But when I put on weight it always goes to my lower body so I dunno :(