At least they are somewhat different in setting and style. However, you are not ready to charge yet. If these are your best, you have some way to go. You might be OK shooting friends for cost or a few dollars for fun, but do you think a bride and groom would be happy with this?
http://www.flickr.com/photos/experimentalrebirthstudios/4428694057/
(What is wrong with this one you ask? Unflattering angle and pose, underexposed, blurred, and the white balance is off, for starters.) The cat is much better than any of your people shots, although I do rather like this one for the dark mood:
http://www.flickr.com/photos/experimentalrebirthstudios/4424353246/
As you said, you are just starting out. Learn the basics of exposure and composition first, before trying to take money. Learn how to form your own exposure rather than depending on the camera to do your thinking. Visit the bookstore for books on portraiture, since that seems to be an area you like and are interested in
You are in no way ready to think of shooting weddings, you are simply not skilled or experienced enough. (And probably do not have the equipment and back-up gear, either.) You might do some trade for prints for new wanna-be models for the experience and to begin a portfolio. Offer to shoot senior portraits pets, or kid's birthday parties, things that are less critical to get good results. If someone is not happy with their senior portraits, you can always re-shoot or refund, but with weddings that is not an option.
Continue to learn and practice to develop your own style. Do not be discouraged, but keep at it. It takes a while to become competent at any craft, including photography. Start with small steps and build your skill and portfolio. Best wishes and good luck.