boyfriend doesnt know i cant get pregnant

so im 22 and never was i on any type of birth control. .... and never pregnant.... 🤔so my boyfriend and i have been together for 2 years... he used condoms before but now we dont use anything... i know i cant pregnant because i been with guys that never used condoms ever and i never gotten pregnant.. 😟... my boyfriend doesnt know that im not even gettting pregnant because we do have sex.. its really hard for me to know that i never conceived and i dont want to tel him because he might leave me... Its sooooo weird i havent gotten pregnant and i havent went to the doctors because of this... My grandmas sisters couldn't conceive so im thinking i'll be like that them. Im so young and i cant even conceive yet and it really hurts..  i know something is definitely wrong with me.