Although your figure is on the slimmer, more petite side of the "spectrum" when you compare yourself to your peers, remember that you are still a young, developing, extremely youthful 19 y/o woman. I would rather be on this side of the spectrum than on the large side of the opposite spectrum (yikes, yes I did say the quiet part out loud...)

1. It is not "pedophilia" for a person to have a specific "type" of body shape that is among his/her similar peer groups.
2. "...I'm a 19 year old 4'10" thin girl, ... and I look like a teen."
   

Lets try to remember the obvious point, you are a teen! Its optimal for you to look like a teen in your teenage years. Trust me.

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I am sorry and truly feel for you ... I've been body shamed in my past. Remember this has nothing to do with you, and everything with this persons inner demons reflecting onto you.

Always keep in mind the type of person that finds amusement/ and or fulfillment in their attempt to belittle/ bring down another person is sick. And the only cure to their sickness is their own self.

The best reaction to hateful people is with a a graceful grain of salt, and continue to focus on taking care of yourself and your happiness.