Praise be to Allaah.
If you are able to, then do not pay the interest, so that you will not be counted among those referred to in the hadeeth: The Messenger of Allaah (peace and blessings of Allaah be upon him) cursed the one who consumes riba, the one who pays it, the one who writes it down and those who witness it, and said that all are equally sinful. (Reported by Muslim, 2995). All of them are cursed for their participation in this sin.
In order for a Muslim to avoid giving a bad impression to the people from whom he took out the loan and who may be unaware of the fact that it is forbidden, if he does not want to pay the interest, he could explain to them the shari reason for this. If you have no choice and are forced to pay the interest, unwillingly, then your repentance should be sufficient, in sha Allaah.
May Allaah bless our Prophet Muhammad.