You say you can’t but, yes, you can tell your boyfriend that you don’t like the pressure. You can say that you enjoy talking to him but not about sexual stuff. If you can’t bring yourself to speak your mind and he keeps making you feel uncomfortable, free yourself from this relationship—immediately. Don’t worry about being mean. Right now, he’s not worrying about how you’re feeling, is he? Trust me—you’d survive a breakup, and so would he. If you feel you are ready to be in a relationship, then you also need to be prepared to assert yourself in situations that make you uneasy.