Inner thigh pain due to soccer kick or run?

Adductor strain. It sounds like you may have strained or have tightness in the adductor or groin muscle i would recommend gentle stretching of the affected area prior to exercise.
Muscle. Inner thigh pain or adductor strain is seen often in soccer players and can be related to imbalance between the hip abductors and adductors of the hip. A carefully organized core program would help prevent this from happening.