You won't be entitled to Unemployment Assistance - the means tested payment - as you are under 18.
You may be entitled to Unemployment Benefit - non means tested - if you have enough stamps paid. If you have been working for 9 months (39 weeks) since you first started employment you may qualify.
Those 39 credits, while probably in the wrong year, will allow you to claim "Pre-Entry Credits" for the correct year, currently 2004, if you entered the workforce since then.
More info here http://www.welfare.ie/foi/ub_unempben.html#part12
Drop in to your Social Welfare Local Office and they will check it for you.