You say that it was the worst decision, but I don't see anything that suggests that...only a lack of success thus far. It probably has far less to do with you than you think it does, and even the most successful people on those sites don't get responses from everyone. It is common to get a 10% response rate or less to messages.
I see a few common trends in people's papproaches here that don't have much success, so I can address those since they may be what is hindering you. The first (and most important) is pictures - try to have pictures in good lighting and interesting settings, that compliment your features. The absolute worst pictures are the ones taken with a webcam at a computer, or the ones taken in poor lighting indoors. The second is profile content: elaborate on who you are, what interests you, and what your goals are in life. Add in some interesting tidbits about yourself, and give the reader a reason to want to get to know more about you. If all you write are a few boring lists of facts about yourself, then it will get lost in the sea of hundreds of other profiles.
The last piece of advice is messages. Make them a few sentences at most, and ask at least 1-2 questions. Keep the initial communication brief, but not too brief...messages that just say "Hi, what's up?" will get ignored 99.9% of the time. My first messages are generally 4-5 sentences with a question or two about something in her profile.
When I first joined the site, my profile was atrocious and I hardly got any replies. Since then, I've improved it and not only get quite a lot of responses, but I managed to find my first serious relationship through the site recently.