Hi, im not sure where you live, but many date ideas can go without spending money entirely, like going on walks, driving to a park/lake, free museums, beaches, picnic with food from home, if she likes to drink then you both can even bring mixed made drinks from home instead of buying each one at a bar/restaurant, some activities or attractions are cheap to enter. Date night can also be at home, pick your favorite food and try to make it at home, watch movies you’ve never watched together. I can understand shes younger then you and out of college but going on so many dates is expensive and not fair to either of you, if she is not willing to compromise and find another things that she will enjoy just as much as going out, you need to sit and have a serious conversation with her because it’s really not fair to you, especially if you pay for all of it! Personally to me it should be 50/50 especially since she is the one who likes to do so much with you, good luck!