I'm going to do a project on my own and not show up to the presentation
Why would you do a project alone?
I don't care about helping others.
It's bad to not follow through on academic assignments. You should do what is expected of you in school.
I am doing this for me, so why do I care about following other people's rules?
You can learn for yourself, but there are others that you are responsible to in school. Everyone needs to contribute and your contribution is about completing the whole assignment. Take charge and make the presentation.