You need to stay entirely single minded on your goals.
Some people mention a "law of distraction" relating to LOA. That is what your parents are to you right now.
Stay on track with your goals; your instincts are right about business, I can tell. Even your screenname on here is sharp.
If you are single minded about your goals your parent's opinions won't matter.
Are your parents somehow stopping you from doing what you want? I doubt it.. it's the internet, a homeless person can pretty much run an e-business from the library.
Is what you want to manifest an endless debate with your parents? Because thats what you are creating by worrying about this.
Don't worry about them. At all. Worry about your goals. When you validate their fears by acknowledgement they will only grow stronger, and each minute you are distracted from working on your businesses that intention grows weaker.
What you pay attention to is what will manifest. Whether you think you can or can't do things your way, you're right. Stay focused on your goals, not your parents.