pain after urinating

for the past week and couple days. i have been feeling a very sharp pain in my clit after urinating. sometimes during the day my clit feels wierd or sensative in a way...my mother gave me a cream called "lotrisone" to use after every shower i take...i am 16 and water is not a big part of my life but now i am drinking straight water and the pain is not so bad....so my question, is this normal? is it serious? what should i do? hope i can get some help fast because i am so afraid to go to the bathroom and urinate because the pain is so bad....