It sounds to me that you are an adult.
You don't need their permission. And they don't need you sharing things with them that are absolutely none of their business. They may believe that they are entitled to be involved in your personal business, but keep reminding yourself that they are NOT.
Your livelihood and your education are none of their business, and they shouldn't be meddling with your life choices. I had to deal with the same kind of mentality when I went back to school, and that was when the JW rules on "higher education" were somewhat relaxed.
We ended up moving outside the circuit to be closer to campus. We never set foot in the Kingdom Hall™ after that point, although at first we didn't rule it out. Still the judgemental attitude reared its head whenever we met JWs we knew: "Why are you wasting time in college, when Armageddon Is Just Around The Corner™??" My answer was that I wanted to provide for my family, the way the Bible expected me to do, because I sure as hell couldn't rely on the Congregation™ for that, and I learned the hard way that when times were tough, help from the Congregation™ was nowhere to be found.
Well, not only did I graduate with honours, I started earning a very decent living that I never could have hoped for with just a high school education. I have paid off my student loans, have a pension plan and can retire in less than 10 years, excellent benefits for myself and my family, have a car that I own, and could support my family independently if that became necessary.
That was 17 years ago. What would my life be like had I listened to the JWs who kept telling me that going to school was a waste of time? It would be exactly like the JWs lives are who warned me against higher education: exactly the same as it was 17 years ago, with the same financial struggles and hardships that I've put behind me.