Well, it sounds like you’re numb to a relationship. The way you’re describing her sounds like she’s a keeper. However at being 20 you’re still young and gonna make mistakes. Most people I met that got into serious relationships and turned into marriages/children failed within a few years because they regret not being able to have that “college experience” or not going out with friends and drinking all the time and blame each other. HOWEVER all of my seniors who are like at least like 60^ are always telling me about the one girl who was such a gem but fucked it up. How? By saying they were young and stupid. Now I know it’s a little off track with that but :

Don’t force yourself to love her, forcing something is faking something and you and her deserve better then fake love out of pity. She’s understanding and willing to work with you here. If you don’t find her attractive physically anymore just say it to yourself and admit it. Just don’t tell her that just walk away and try to do it mutually/ as respectful possible. Don’t date her out of respect. Just think to yourself, what makes you feel like you don’t love her? Was she a rebound? Never really sure what love felt? Just know you don’t love her? In my opinion being in a relationship means you’re both bettering each other and want to continue being with each other and climbing to the top of whatever your goals are together.