Frankly chances of you contracting HIV are very low. But is it close to zero, nope i dun think so. Coz there are cases of people contracting HIV even with protection. One good example is my friend who died from AIDS many years ago.
End of the day, the best way to find out whether u have HIV is to visit DSC or one of the clinic in Singapore and carry out a HIV test.
If u are unlucky enough to obtain a positive result for ur HIV test, just remember to hold ur head high and wipe away the tears, life still goes on. Dun go committing no suicide.