cute cat pic and funny juxtaposition, but real talk:

In the scientific context (in which the subject is speaking because they reference both physics and a place of education) one does not have "theories", because theory is the plural of theorem, and a theorem is a collection of related facts which conclusively describe, with predictive accuracy, the causes and effects of a phenomenon.

But if one does indeed wish to present one theorem or more to the scientific community, one may attempt to publish a paper - not to a college, but to a scientific journal. Then, other scientists from around the world will be able to attempt to experimentally reproduce the cause and effect relationships which your theory attempted to describe, and a consensus will form as to whether each theorem is, or is not, bunk.

This is an excellent video by a physicist about crackpots: https://youtu.be/11lPhMSulSU?si=ZGslcTKyp5Wxt1KE

If you have this kind of theories, maybe see a doctor

This is a common issue in physics. If I am not mistaken there is a site dedicated to answering amateur-physicist questions, askthephysicist dot com.

That's what we call a crackhead