AITAH for feeling bitter towards my sister

Long story short... So we are 3 sisters still living under my parent's roof. My sister got her driving license before me and I was asked by my parents to contribute 50k towards a car that will be used by all of us... including me and the youngest who have not yet obtained our driving license.

Now it has been a year and my sister drives to work every single day day while I dont even get the chance to practice for my driving test. Also, I take public transport to work and it fills me with resentment to see her driving around in a car bought with my hard earned money while she didnt contribute a single cent!

When i told this to my family, they said they will return the money when and if the car is sold. Like wtf? I feel so stupid for having contributed such a huge amount. Again, refusing was not an option...I would have been labeled as egoistic and be in their bad books.

What the fuck should I do now?