How To Prove That I Am A Virgin At This Time?

im 22 year old female virgin, my boyfriend told me if i do not bleed during my first time, it means i was leiing and was never a virgin. i've only ever masterbated and have used a small handle to a hairbrush to insert inside during masterbation, would he be able to feel tightness and a resistance when insterting inside of me? giving him a sign i am infact a virgin?