Im 15 and im really short and havent even had my period?

whats wrong with me i feel like i have a problem i havent even hit puberty and im 15 most girls in my grade are so much more developed than me and everyone looks so much older than me im only 4'11 and im tired of everyone making fun of me for being short and guys dont even look at me or ask me out or anything and its not like im ugly so i just feel so left out of everything what should i do?? is their something wrong with me is this normal because i dont know anyone in my entire grade who hasnt had their period