Hi there! Aww, poor thing, but don't feel bad. It's your time to live! Your daughter is 15 years old now and you need a companion other than her....all adults do.
You have to start trusting again. Gain the confidence and you will attract the right type of mate. Don't settle for losers! Don't even give them the time of day.
The most important thing you need to work on is yourself. Get happy! Get out there and live your life! I know from experience because I was in a similar type of situation a few years back. I had gone about 7 years without dating and finally tried online dating after all my family and friends nudged me into it. It can be tricky.
I wish you the best of luck and please reply back and let me know how things are going!