If you like aluminum needles, stick with them. There's no law that says you have to use bamboo, rosewood, plastic, or resin. Use what works for you.
I switched from aluminum to bamboo simply because it was hard for me to keep stitches from sliding off the aluminums. Bamboo gave me just the right "texture" to make my knitting easier for me. I learned on plastic, but had trouble finding plastic - everything had gone to aluminum or bamboo. I tried with aluminums, but was getting very frustrated, so tried bamboo and have never looked back. They are what works for me.
Knitting has no laws - it's all based on what you like. If you don't like it, you're not going to enjoy it.
Have a ball!!!