Hi, i've been having a small pain under my right breast (male) and, i've read up and people say it's a collapsed lung or costochondritis, do you know?

Multiple reasons: There are multiple reasons for a male to have lower chest pain or upper abdominal pain. You need a complete history and physical by your physician to diagnose you. Collapse lung is associated with shortness of breath. Chondritis can definitely occur with specific trauma. Pneumonia has been know to cause chest pain like that. This could also be referred pain from the upper abdomen. See a doctor.

You are correct: You are correct that both of these conditions can give you chest pains - non cardiac, but usually they are located in different place and they stronger. Possibly you have muscular pain due to pulled muscle.

Possible: Both conditions can cause chest pain. The most important thing you can do is discuss your symptoms and concerns with your family physician. A more definitive answer, and possibly alleviate your concern, will depend on thorough review of history and physical examination. Based on that, additional studies may be indicated.