All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.
It is impermissible for a Muslim to partake in any transaction involving Riba (usury/interest) even if one intends to repay it before the specified time so as not to pay interest, because it is impermissible for a Muslim to enter a prohibited contract in the first place as highlighted in Fataawa 88473 and 98959.
You are advised to explain this to your parents so that they terminate that loan. However, if they did not and they paid your tuition fees from this usurious loan, you bear no sin for that and they are the ones who bear the sin for it.
Allaah Knows best.