Communication is key in every relationship. If you don’t enjoy sex express this immediately, even during sex, if there is something you don’t like, communicate it. Your partner cannot know if you don’t tell them. It is super important to be very open in a relationship and always express what you feel. Share your feelings, share what you like, what you don’t like, what makes you feel awkward or scared or what hurts you and makes you feel uncomfortable. Your partner is there to cherish you and love you and there is nothing that needs to be hidden.
If you don’t communicate, then what are you doing? You start to pretend to please the other and this is abusive to yourself and disrespectful to your partner.
If your partner is not open to listening to your feelings you need to re-consider the purpose of your relationship.
A relationship is a space of mutual growth and you should feel cared for and safe to express and communicate whatever you feel.