I have a splinter in my finger i cant see it but its painfuland i cant get it outshould i worry??

Since you can't identify it and it's painful, you should see a doctor. To know what and where the foreign body requires an examination. Worsening pain can be a sign of infection and other complications depending on where it is and how contaminated it was initially. We also need to be sure your tetanus is up to date. See your doctor or go to an urgent care clinic or the emergency room today.

Is it a wooden or metal? either way since you have pain you should see a hand specialist to remove it and avoid possible infection.