Suggest Remedy To Make Vagina Tight During Sex

Hi, im 21 years old and my boyfriend is 22. We have been dating for 1year and the sex used to be great, but over the last month it has gotten pretty bad. I feel that it is my fault. Is it possible to become too wet? I feel that I get too wet when having sex and its not pleasurable for him or me anymore, he comes everytime but I don't want to have sex anymore I feel so bad I was thinking of using china shrink cream so I can be tight.  What can I do?