Bro, people are just fuckin with you. You're most likely fine. If it starts to get nasty looking then go to the doc and get some antibiotics. My guess is that your finger will live to see another day...
I doubt there will be any infection, people prick their fingers all the time. If it does get infected go to the doctor, tell them you were prying a staple and it went straight into your finger.
The doc will probably prescribe you keflex or some other antibiotic.
Holy Shit Thank U Guys Even If U Did Fuck With Me I Dont Care As Long As I Got My Health Seriously Dudes Thank U From The Bottom Of My Heart. I Dont Have Ne Where Else To Turn Sept For Here. Ty Again
Just chill...its no worse than cutting yourself from an old knife, or other sharp object. Just cause its a dirty needle, makes it no worse, unless it was someone elses, in which case it is only dangerous if they had an infectious disease.
I think you should get your arm taken off at the shoulder just in case. Just fucking around. You'll be fine as long as it was your needle and not one some else used.