Am I selfish??

Today, we just bought a laptop for me. It's my first ever laptop after begging my family. Even though my brother has one he never let's me use it unless it is necessary. He also have his own password to it. So when I wanted to have my own password, he said no because he won't allow me using it and the password must to know for everyone. But I got angry and said no it's my laptop (I know it's dumb) but now I am kinda sad. He never shared me his phone or laptop, I don't care if they use my laptop but I still wanted to create my password secretly, I could open for them too. So I think I acted too selfishly. So I feel bad now....