Pressuring me into unprotected sex

My boyfriend is wanting to have unprotected sex more and more often, and I know it feels really good to both me and him, but now I'm having to buy plan-b for the second time and I am so scared and stressed. We are both 16 (please don't say anything about being too young, I know and it's my choice). He doesn't bring condoms when he comes over and then he gets horny and pressures me to have unprotected sex. I like it when it is happening but I am so anxious and scared of getting pregnant, I am too young and I don't want a child for a very long time. I don't know what to say to him besides no, because he always convinces me. I enjoy sex, but I do not want to fee this petrified ever again. Please give me suggestions for what to do/say. I love him, and sex is fun in the moment, but I can't stop thinking about what might happen. Please only support or relevant comments, I really don't want to cry anymore about my stupid decisions.❤️