2. Pressure from family, friends, brothers... They all expect me to continue doing things the same way I've been doing all these years.
You are young....in a number of years, you'll realize that people are not thinking about you and what you are doing, as much as you may think they are. They are more concerned about themselves. I don't mean that in a bad way, I just mean that people naturally think about their own responsibilities and what's going on in their own lives first and are somewhat interested in what you are doing.
Most of their interest in you has to do with how what you do, affects them. They want you to stay the same as you are, so that they don't have to question what they are doing. Humans are creatures of habit. They often don't want to spend any of their energy on thinking about you and adjusting their idea of where you fit into their life and their routine. They want you to stay in the pigeon hole they've created for you . This isn't out of concern for you....it's out of concern for their own comfort.
Other than family, people come and go in your life and if you build your life around everyone else's wants, they'll move on and you'll be left wondering who's life you are living. My advice is to decide what you want for yourself and set a plan in motion to achieve it. There's no reason to cut anyone out of your life over this, however what other people think about your new direction should only be of mild and passing interest to you. You can politely thank them for their advice but offer no comment, apologies ,explanations or excuses to them about your personal decisions. You will see that once you own your decision, they will adjust quickly and will move on. Thankfully you did this to get through University (congratulations) . Imagine where you'd be today if you let pleasing others, stand in your way.