I want to do my own science, how can I make my mind towards it?

I love your passion for science!! Whatever stage you are at, whether you are in high-school, freshman in college- try searching for opportunities to get involved in a research lab. In the sciences, we have what are called PIs(Prinicipal Investigators), who are usually the ones who drive the research- they are the ones what the research will be on, how they will answer the question at hand etc. To be a PI, you almost have to have a PhD, which is considered a terminal degree. There's always plenty of opportunities to volunteer at a research lab, move onto a paid position or get credits for doing assisting the grad students or other senior members in the lab. You can usually get involved even as a high-school student.

There's plenty of opportunities as an undergraduate to join a research lab, talk to any faculty in your department on how to gets started- They should be able to help you.

A personal suggestion would be to not stick to your own department, venture out and check out what PIs at other departments at your school do. You'll be surprised how far-reaching each field of science is. A chemistry student could be in a neuroscience lab doing chemistry things and vice versa.