What's normal???

Am
Hey everyone ☺️ So lately a lot of people have been commenting on my body. I am 19 years old, 5'3", and am 105lbs. I'm pretty tiny compared to my siblings (I'm the oldest child). Is my weight average for my height? Also, I am really struggling with my breast size. I'm a 34B, and I've been this cup size since I was a sophomore in H.S. I feel like everyone around me had growth spurts and I got stuck. Any words of encouragement? 
UPDATED AS OF 11.12.16 🚨🚨 
Thank you all for the encouraging words! As of right now I have begun running (as my main workout along with others). I have ran 2 15k's so far (15k=9 miles) and I'm training for a half marathon and hopefully one day a full marathon. I will post pics a little later but I wanted y'all to know that I have put on a little more weight because of my muscles! I'm now 110 lbs and I feel healthier than ever! I hope at least 1 person  finds this to be encouraging whether you're trying to lose weight or gain 💪

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