I'm 13 years old and since i can remember i have been getting very painful stinging pains in different parts of my body sometimes on my stomach leg thighs ankle arm hand and toe Ive always wondered is this was normal i also have aching pains in my knees when i bend down and sometimes my leg will start to hurt while I'm walking could you please help me figure out whats wrong with me I'm desperate for answers PLEASE HELP !!