As a Pennsylvania resident you do owe state income tax on your earnings and income.
If you are a W-2 wage earner, you need to ask your employer about revising tax form W-4 to have enough taxes withheld to cover your state tax obligations.
For more information, follow this link:
https://www.revenue.pa.gov/FormsandPublications/FormsforIndividuals/PIT/Documents/2018/2018_pa-40in....
