Venting

Why is my boyfriend always mad when i refuse sex? I dont refuse most of the time, but i did it because i didnt feel like it and i dont like getting fingered, for reasons and he just got INSANELY UPSET and told me im the only one who doesnt want sex in all the ladies there are that im like TENSE ? I dont really know how or what to feel honestly its so degrading i started sobbing. Its not the fist time either. He’s already told me im boring because i do it once and im tired ( im 19 and working a part time + school) and he expects me to be a beast.