Since i'm allergic to penicillin, i was prescribed cefazolin, but i'm terrified of needles. can i take pills instead?

Depends: Usually antibiotics are administerd intravenously in order to get a high level of the drug (higher than that which can be acheived with a pill). Depending on the type of infection you have, you may need the intravenous form. The pills may not be strong enough to treat the infection.

Pen/cephalosporins : It depends . First of all, the first choice substitute antibiotic for a penicillin-allergic person is not a cephalosporin, especially a first-generation one like cephazolin. There is a small chance you will be allergic to the cephazolin, and giving it parenterally is much more dangerous than orally. The type of infection you have determines what antibiotics you can use. Ask your doctor for options.