Trouble finishing...

So me and my boyfriend have been having sex for just over a year now and I have yet to orgasm. It's frustrating because it's like we get to the point where I feel like it should happen at any second, but it never does. Idk if it's my body that's just not capable of finishing or if it's him or idk. I just want it to happen already! Any advice or words of wisdom? Similar stories or problems and how to fix it?