I know you're tired of people saying that you're "better than this lifestyle". When you're the girl who engages in casual relationships, people like to make assumptions. Sometimes they will think you're insecure, that you secretly want something more-- though that might have been true at one time-- you know it's not your intention these days.
Sometimes your lifestyle makes people uncomfortable; so much so that they try to convince you that it's not what you want at all-- in there eyes you are only playing hard to get. When you state that all you wanted was what you stated originally, you are told that there is something wrong with you.
People will call you a "tease", "slut", "whore", "tramp", or "bitch"--to your face, or behind your back. However, these same people don't try to understand how much your past committed relationships have actually hurt you, how he made you feel like you were hard to love, selfish, isolated, and treated your future as if it was his own.
When you're the girl who engages in casual relationships, you should realize there is nothing wrong with you because you do not completely understand your feelings for someone, there is nothing wrong with you for not wanting to feel tied down. You deserve to feel the exhilaration of sliding on ice and the satisfaction of catching yourself before you slip and fall.
When you're the girl who engages in casual relationships-- others will not always understand your choices, but that doesn't mean you shouldn't thrive. Just because you give into lust from time to time doesn't mean your accomplishments and successes are any less valid; just because you are able to walk in and out of someone's arms easily doesn't mean you are easy. You are strong and secure enough to be content on your own and not everyone is used to that-- but that doesn't make it a bad thing.