AJ is right. You have to be comfortable w/yourself first and then w/someone else. Jumping into a dating pool can be difficult and like AJ pointed out...your reference point is only your marriage.
Like I said, I date periodically, but I also have a lot of male friends and we do things together, i.e., just enjoy each other's time together w/no strings attached. I also do a lot of things solo. I may be crazy, but I enjoy doing things solo. I enjoy my own company very much. At least I can laugh and say "I'm in control of the remote and not have to argue w/someone about what channel to watch". LOL!
Sometimes, I go one step further and tell people the same thing that Princess Diana stated in an interview "there were three of us in this marriage" and then I say "I rest my case".
Don't rush into dating until you feel comfortable in your own skin. Give yourself time to heal from the divorce (if it happens). I've seen entirely too many people rush into new relationships and then discover that they weren't healed enough to let go of the previous marriage baggage.
As for dating sites, well, I've had many a laugh. I signed up for one that has a questionnaire that you complete. I was very critical of my likes, dislikes, interests, religion, etc., and I just knew that I would never get any interest. Lo and behold! I started getting all sorts of hits and none of them met my any of my responses to the questionnaire. To this day, I still laugh about some of those guys and what they were looking for. I did actually date one of them and all he wanted to talk about was his lack of performance and that's why his wife had left him. Can you just imagine someone talking about such a thing on the first and definitely the last date? LOL!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.