I received my W-2 and it said State withheld only 63 dollars. Why so little when in the past State took out around 900 before. My income was around 18,000

If $18K is your total income, then your expected CT tax for the year is only about $68. If previously they withheld $900 on $18K of income they were withholding way too much.

FYI - there's a handy on-line estimator for CT taxes here:
2009 Tax Calculation Schedule