How do I change my boyfriend icloud and have my own?

What do you mean? Are you saying your boyfriend's iCloud account is signed on to your iPhone? Do you have your own Apple ID? If so, is it signed on to your iPhone?

If so, then you can create an iCloud account by following the steps in this support article:

http://support.apple.com/kb/HT4436

Cheers,

GB

You will first need to make a new Apple ID for you, then go into your iPhone settings>iCloud then delete the account, then add you account with your new Apple ID.