Over Controling Mother?

Im 18 and my mother is extremely controling. She acts like my obligations also belong to her. I recently started an online business and she's ALWAYS on my *** about getting work done. My business is guitar repair/distribution of luthierie tools (guitar making tools). I've been fiddling with guitar repair since a young age and have built several guitars. My mother doesn't know the first damn thing about music OR running a business but she acts like shes my damn boss. Its not just this, she acts like this with EVERY aspect of my life. When I try to explain to her that she needs to let me take control of my business, problems, life in general, she get pissed and starts talking about how disrespectful I am (even when talking respectfully, not shouting, being calm, ect.) and uses the excuse that shes my mother and shes trying to teach me lessons and other stuff like that boasting her parental authority. At this point done with this completely bullshit, its driving me crazy. I want her to loosen her grip on me, but if she cant then I'd get her out of my life. I really don't want to do this because she my mother and I love her and I want us to be close, but she needs to realize that my problems are MY problems, my obligations are MY obligations, ect. and if she cant, then I'm done. I wouldn't COMPLETELY remove her from my life, but she would be playing a significantly lesser role, which is sad because shes my mother. i love her and want to be close to her but not the way it is now. How can I get her to see eye to eye with me.