Why can't i feel anything during sex?

ok i lost my virginity at the age of 18. and now i am almost 20 . the first time was painful then after the pain went away, i couldn't feel anything else and from that day on since i've had sex i still can't feel a thing. not even when my clitoris is being rubbed i can't stay stimulated. can anyone tell me what is wrong with me
 
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