It does sound like it could be vaginismus. Vaginismus is a tightening of those initial muscles into the vagina. If it’s vaginismus, you would need a set of dilators to work on gradually relaxing those muscles, making penetration easier. The estrogen cream is helpful in maintaining the vaginal skin and preventing atrophy, but it won’t help with the muscle tightening. Of course, I can’t make a diagnosis over the internet, so you should follow up with your provider and express your concerns.