Dear dipak,
She is screaming there may be two reasons. One might be that you are so fast so she will feeling pain thats why she screams. Or it might be that she enjoying it but as you mentioned i think she screams due to pain. You should use proper lubrication to avoid this problem.
You are fast so i think you should change your sexual position. I think you should use Cowgirl position or Women on Top position, so that she controls everything. I mention the reason here why she screams but i think it would be better to ask her same question as she knows the reality that why she screams.
She is screaming there may be two reasons. One might be that you are so fast so she will feeling pain thats why she screams. Or it might be that she enjoying it but as you mentioned i think she screams due to pain. You should use proper lubrication to avoid this problem.
You are fast so i think you should change your sexual position. I think you should use Cowgirl position or Women on Top position, so that she controls everything. I mention the reason here why she screams but i think it would be better to ask her same question as she knows the reality that why she screams.