Customize primary navigation menu bar on my website

I want the drop down list under stores modified (see attachment) so that MY PRODUCTS, MY SHOPPING CART, MY ORDER STATUS are customized to show individual user accounts rather than the default store template. For example if you were to sign in and shop or sell something you will only see under these 3 menu options your product, items in your shopping cart, values thats specific only to you. Good knowledge of CSS is needed.