My friend was diagnosed with bacterial meningitis, can i catch it from him?

Sure: If you are a close contact with him you likely need medication to reduce your risk of contracting this. Usually in this scenerio the local health department is involved in making sure all those exposed are treated adequately so you may need to contact them for advice.

Likely: If this is meningococcal, it could be very contagious, but other forms may likewise put you at risk. Contact your doctor asap, and decided whether protective measures such as vaccines are indicated/.

Depends: There are different organisms that are more associated with bacterial meningitis. The two common in your age range are the pneumococcus and the meningococcus. Meningococcus causes so-called infectious meningitis. The risk of transmission is low except for close household contacts and those exposed to oral secretions. Prophylactic antimicrobials can do used for appropriate contacts.