Estrogen-containing vaginal preparations are prescription only. If you haven't tried lubricants and moisturizers, which are available over the counter, you might try those first.
Lubricants are designed for short-term effect, to make intercourse immediately more comfortable. They can be water-based, silicon-based, or a hybrid of the two.
Vaginal moisturizers are designed for longer-term maintenance of your vaginal tissues. They don't contain hormones, so don't require a prescription. They're typically used every several days.
Localized estrogen, which is available as a ring or vaginal tablet in addition to cream, helps to increase blood flow and elasticity in genital tissues. If you've tried lubricants and moisturizers and haven't yet been comfortable during sex, consider talking to your health care provider to see if localized estrogen or another hormone therapy might be right for you.