WordPress Menu With HTML 5 Attributes

I need help creating a custom WordPress menu. WordPress Adds its own classes that I don’t need. I need someone to help me solve this issue. WordPress doesn’t add some attributes when I need them on drop-down.

Here is my HTML code.

<nav class="navbar navbar-default navbar-static-top">
    <div class="container-fluid container">
        <div class="row m04m">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#main_nav">
                    <span class="bars">
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                        <span class="icon-bar"></span>
                    </span>
                    <span class="btn-text">Select Page</span>
                </button>
            </div>
            <div class="collapse navbar-collapse" id="main_nav">
                <ul class="nav navbar-nav">
                    <li class="active "><a href="#">Home</a></li>
                    <li class=" dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">About</a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Company Profile</a></li>
                            <li><a href="#">Board of directors</a></li>
                            <li><a href="#">Owner's message</a></li>
                            <li><a href="#">team</a></li>
                        </ul>
                    </li>
                    <li>
                        <a href="#">projects</a>
                    </li>
                    <li class=" dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Media</a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Gallery</a></li>
                            <li><a href="#">documents</a></li>
                        </ul>
                    </li>
                    <li class=" dropdown">
                        <a href="#" class="dropdown-toggle" role="button" aria-expanded="false">news</a>
                    </li>

                    <li class=" dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">contact</a>
                        <ul class="dropdown-menu" role="menu">
                            <li><a href="#">Conact us</a></li>
                            <li><a href="#">Careers</a></li>
                        </ul>
                    </li>
                </ul>
            </div>
        </div>
    </div>
</nav> <!--Main Nav-->