Help please!

How do I go about getting the depo shot? I've went to my doctor and she doesn't do it and she sent me to antithetical doctor and they only give out pills.. I'm just so frustrated at this point because I rather have the shot because the pill brand they gave me have all NEGATIVE reviews.. Please someone help me by getting the depo shot. Btw I'm 17 going on 18 in a couple of months and I just really prefer the shot