Hunny, there are n number of reasons that can be. From hunny1990 I am assuming you are about 21/22 years old. Please mention on your own next time.
You needed to mention the method of masturbation. For a regular clit focused one without inserting anything, you wont have any problem. But if was inserting something thicker, the hymen would go away.
I dont suggest any cream or anything. To tghten the muscle, you should play with pussy glands tighten method. Thats the PC muscle squeeze method.
The pussy felt wide can be for few reason, using something thicker before, losened glands, too much lubed so felt loose grip, not able to grip with pussy gland, not taking right position and above all, your guy has a thin dick.
You dont have to worry on this issues much, a lot of girls has this problem when a guy dont feel a tight grip. For this, you need to take the right position, and try PC muscle squeeze technique.