Trying to update profile ( html form to mysql using php )

I'm trying to give my users to update their profile. but something is wrong... it says that users successfuly update profile but in mysql won't change it

i hope you guys could help me

here is my HTML:

  <div class="panel-body"><form method="POST" action=''>
    <br>
                                            <div class="form-group input-group">
                                        <span class="input-group-addon"><b>Uporabnisko ime:</b></span>
                                        <fieldset disabled>
                                            <label for="disabledSelect"></label>
                                            <B><input type="text" id="disabledInput" class="form-control" placeholder='<?php echo $userRow['username']; ?>' > </b>
                                            </fieldset>
                                        </div><Br>  
                                        <div class="form-group input-group">
                                            <span class="input-group-addon"><b>Vzdevek:</b></span>
                                            <input type="text" id='novvzdevek' name='vzdevek' class="form-control" placeholder="<?php echo $userRow['vzdevek']; ?>">
                                        </div>

    <br><span>                                       <div class="form-group input-group">
                                            <span class="input-group-addon"><b>Ime:</b></span>
                                            <input type="text" name='ime' class="form-control" placeholder="Ime (neobvezno)">
                                        </div>
    <br>
                                      <div class="form-group input-group">
                                            <span class="input-group-addon"><b>Email:</b></span>
                                            <input type="email" id='email' name='email' class="form-control" placeholder="<?php echo $userRow['email']; ?>">
                                        </div>
<br><br>
                                           <label>Izberi spol</label>
                                            <select class="form-control" id='spol' name='spol'>
                                                <option></option>
                                                <option>Moski</option>
                                                <option>Zenska</option>
                                            </select></center><br><br><br>


    <br>

    <br>
    <br><input type='submit' value='Posodobi izkaznico' name='btn-edit' data-toggle="modal" data-target="#myModal">
                              <br>   
    </form></div>

and here is my php:

<?php
include_once 'dbconnect.php';
if(isset($_POST['btn-edit']))
{
 $vzdevek = mysql_real_escape_string($_POST['vzdevek']);
 $ime = mysql_real_escape_string($_POST['ime']);
 $spol = mysql_real_escape_string($_POST['spol']);
 if(!empty($vzdevek))
{
    mysql_query("UPDATE users SET vzdevek='$vzdevek' WHERE vzdevek='$vzdevek'") or die(mysql_error());
                echo("You have successfully updated your Name");
}
if(!empty($ime))
{
    mysql_query("UPDATE users SET ime='$ime' WHERE ime='$ime'") or die(mysql_error());
                echo("You have successfully updated your Password");
}
if(!empty($spol))
{
    mysql_query("UPDATE users SET spol='$spol' WHERE spol='$spol'") or die(mysql_error());
                echo("You have successfully updated your SPOL");
}
 mysql_close(); 
 }
 ?>

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