As we age, the body does not produce enough natural lubricant.
Your doctor can prescribe hormone cream to apply to the vagina so that it is not so dry.
Make sure that you are well aroused and you and your sexual partner are well lubricated before he enters you. You can buy KY Jelly in most big stores these days. If you are embarrassed to purchase anything like that, you can also purchase through the web and it will be delivered to your door discreetly.
Best wishes.
One can try female deer exercise, to normalize sexual system specially after menopause.It will take minimum 1 moth to see the tangible result. Exercise is not harmful.
This is not uncommon after menopause. Have you tried using a water based lubrication? You can buy it at any drug store. If this doesn't help you can see your gynecologist and he/she will give you more options.