2) Hate on relationships. It's fine to enjoy being single, but it's no one's place to judge others for being in relationships, whether you find it's a "good" or "bad" one.
3) Brag about it to friends. Again, it's fine to enjoy being single, but no reason to tell your friends who are in relationships that "you're soooo glad to be single", especially when they're having issues. I'm sure you're not soooo glad you're single when you feel lonely so give me a break.
4) Constantly complain about it. Complaining won't get you a relationship, nor will it get you attention or help, because eventually no one will want to hear it anymore. ESPECIALLY not your date.
5) Not do anything about it. Instead of complaining or feeling sad for yourself, DO something about it. Talk to friends and family to see if someone could set you up. Make a move and ask someone out. Try out different dating sites and apps. I'm definitely not saying that it's easy to find a (good) partner, but there are definitely a lot of ways you can try.
6) Do too much about it. If you're living a "hunting and gathering of partners" lifestyle, stop now and chill out for a bit. You may give off you're desperate or really intense, and that doesn't really turn people on.Your life should not revolve around trying to find love. You are your first priority, ALWAYS. Take a break, and resume the hunt here and there but turn it down A LOT of notches.
7) Not talk about it. Sometimes your friends know you better than you may think, and may have some useful insights for you. Also, keeping things bottled up just doesn't help or make anyone feel good. Just, please, don't write a "omg why am I single" Facebook status, thanks.
8) Be TOO picky. I'm not saying go out with just about anyone, but maybe start giving more people chances and at least get to know someone even if you may not be attracted to them at first.
9) Be a player. I don't care if it's because you want to stay single or because you've been played a thousand times before. Treat others with respect. Don't lead them on for any reason. If you just want to get laid, then do so respectfully and honestly. Being a player just makes you look like an idiot and will get you nowhere in life. So please grow up already.
10) Think it's all your fault. It definitely is not and please be more positive...unless you've just been a complete a-hole player or abuser your whole life, karma is a b*tch.
11) Think you will be single forever. There is someone out there for everyone don't ever stop believing that, if not... well you can always get a few pets :)