I think we all need to learn to set boundaries with others, especially concerned mothers living near us.
I strongly suggest therapy to help you with assertiveness and with setting boundaries. (Leaders are assertive and also set boundaries.)
It's not necessary to alienate your mother in order to come to a mutual agreement/understanding of what you do and do not find helpful from your mother. It can be done.
It's obvious you'd like more space and the freedom to just be. I hope you can find a way to negotiate your relationship with your mom, by expressing yourself. "Mom, I know you care and I need to let you know I need more space. I love you and I would like you to stop ______." Just an example or two.
I wish you the best in negotiating this. Mothers are important and it is possible to stay friendly and still have your independence.

WC