Get the Perfect Personality

Do you ever wonder why you're being ignored, or never being asked to do things? It's probably because you haven't worked on your personality.

Steps

Evaluate your current personality. Are you outgoing, laid-back, friendly, funny, shy, etc. And whatever category you fit in, how are you liked? Do you like your current personality position? If you want to change from one to another you must think about these things.
Let others be themselves around you. If other people can't be themselves, then neither can you.
Fit the part. Whether that means wearing more black, or popping your collar, you have to feel like that personality before you become it.
In any personality, be kind. If you're going for that stuck-up preppy, hard-to-get kind of person, stop. Right now, people just think that's shallow, and they will not want to be around you.
Be laid back. Just go with the flow, and don't create a fuss.
Try to get to know a lot of people. People will want to get to know you.
Don't talk about other people behind their back unless you would say it to the person of subject.
Don't try to be cool.
Don't change who you are, just be a more confident person in general, and you will have a ton more friends. People also prefer the real you.
Honestly, you are who you are for a reason.

When you find your right personality, stick to it.
If you find you want to change your personality again, do it gradually.
Know that a "perfect personality" does not exist.
Use common sense to get along with people. If they are foul to you, avoid them.
Just be who you feel like being - most other people's opinions shouldn't really have an influence on this, as they aren't going to bring you much pleasure in life.
Don't be the whiny wannabe professional victim who deludes him/herself into believing that she/he is persecuted by everybody, but accept it to yourself when people are attacking you and acknowledge the true scale on which it is happening.
You should not drastically change who you are. You should focus more on improving negative parts of your personality and stopping bad habits, while trying to add to your positive attributes.
Learn when to keep quiet. Reactions and decisions are made better after thought. Remember: Think before you speak!

Don't forget time for yourself
Don't even bother trying to change your personality if it's not evil - just go about your life and do that which you feel like doing, not the standard actions of the so-called 'safe' social norm that locks people into a cycle of mental illness and failure. If you're a teenager wanted to be liked more among other peers, remember that the silly, destructive behavior that people may inflict upon you will probably fade as these people get older and more mature.
Do not become something you're not, whether that means learning to skateboard, cutting off all your hair, or buying a new wardrobe etc.
Be bold and defy the silly trends that are supposed to be non-conformist and those that are supposed to be conformist - develop your talents, question your beliefs and rise above the lesser beings who attack you for a feeling of security and ego gained from the belief that their 'safe' path is the best. If you're rejected, go about your everyday life without worrying about your reputation and silently sneer at the unpleasant people for failure and suffering - that's what humor is all about, after all!