You don't have to do everything. Find a few social media sites that you enjoy being a part of and spend your valuable time on those sites.
When I started I tried everything and it got to be overwhelming real fast, and very discouraging as well as ineffective.
Now I have a blog, facebook, twitter, and Etsy teams and I spend my time doing just what I need to keep my marketing effective.
Like Marylin said, time management is also key. It is easy to get sucked in, so limit your time on each site. 5 - 10 minutes is enough time for facebook and twitter, and the more you stick to a schedule the easier it will become.
Good luck,
Valerie
http://additionsstyle.blogspot.com