Has anyone gone through this?

Shelsy

So, whenever my BF and I are having sex, we have a really good time. But I just cannot get to climax, it’s just hard. I feel like I’m ready for it, but when ever it’s time I just get really nervous and stop my self from finishing. We’ve been together for 4 years and a half now. But like seriously I’ve never experienced that. Not even when I’m alone in my room. Any advice?