Help! neighbours want to destroy our relationship

 I live in a face-to face apartment in a crowded compound. People don’t seem to mind their business here. I cannot have privacy even though I live in two rooms. It seems the thin walls in my apartment make it tough for me and my boyfriend to be intimate, during conversations, during sex, without the neighbors reacting. If I’m on the phone and tell him how I feel about him, the couple next door starts to crack up. I thought at first it was a coincidence, but it has happened about eight times. Once I even said, “let’s talk later because the neighbors are listening” and they shut right up.
What’s most offensive to me is if we make a noise above a whisper while talking or making love, we hear the neighbors react by sarcastically making sex noises and laughing next door. This feels like a big invasion of privacy. It’s making me self-conscious to make a peep during intimacy.Do you have any suggestions?