Will i ever grow!?!?!?!?!?

i dunno cause i been the same height for a while or maybe i am just acting negative (i do that a lot)but i am 15 yrs old i am 5'4 in height but... my family keeps telling me i will grow and my half brother is is 6 foot my mother is 5'6 and my dad is 6'1 but i don't want to get my grandmothers genes shes like my height and the last time i grew was like 2 yrs ago... i think lol.but now that i look over what i am reading this is a pretty dumb question isn't it? lol but this is when i become low self esteemed because i am 5'4 skinny/weak i feel pitiful when i see other kids my age and i have a 4.5 in. in length and 1 in. in width and i am a virgin that never had a girl friend because i am so shy and i am so shy because i have no confidence. i mean its not even like no girl likes me its just that when ever they flirt which they used to do i could never react i was too freakin shy. it just makes me feel like a loser and it sux. i know this is not like a real question but it feels better when i type it on the internet believe it or not. lol