Why does it take me forever to have an orgasm?

Very common in women. If you are talking about orgasms with your partner then for some women, foreplay starts 2-3 days before sex. Your partner may need to call you and plant ideas in your mind before they ever get to touch you. Foreplay done well makes sex and orgasms much easier. Anybody can have an orgasm, expert foreplay is much harder to find. Have a chat with your partner about what you like long before you start.
Every1 is different. Forever is a relative term. Everyone has different abilities to reach climax in different amounts of time. The key is to focus on successful foreplay, an often neglected part of sexual activity. And relax, everyone is different.