have me...

You may not know her enough yet. If she is your true love, if she is who you are supposed to spend the rest of your life with, you will know exactly how to tell her.

It's simple, arrange a romantic date where in you could be alone, buy a nice rings, give her flowers and most important is do the things that could surprise her like doing things that she didn't expect you to do. But the main thing is before asking her, make sure that she is really the right girl that you want to be with forever.