the growth plates in the long bones usually calcify sooner in girls than in boys. Get an x-ray of your left rist to be sure they have closed, its not that unusual, especially boys, to grow at 18+ years old. There's even reports of mature women growing an inch or 2 after pregnancy
At 18 chances are even if it's hormonal very little could be done. Most of the long bones will have calcified.
hi , being only 5.1 myself i feel i can be honest ! it aint that bad and you could still grow a little i myself prefer small men and married a 5.3 man and wouldnt have it any other way . they canot give you anything unless it was proven to be a hormone problem .x x
Are you male or female? I can be sympathetic as I've known people that tall of both sexes but the problems for each sex are different as well as what is the norm.