I notice that you said he puts his hand inside you. I assume you mean his finger or fingers, not his entire hand. If it is true that he is putting his hand inside you, this may be too much for your body to handle.Also, keep in mind that many women don’t enjoy deep penetration, and, some even find deep penetration uncomfortable.What concerns me is that you said you are feeling pain–not discomfort–which is something else entirely. Anytime a woman feels pain internally, she needs to have a complete gynecological examination. Pain can be a symptom of an infection. So, get checked.