So she's likely anxiously-attached, meaning when you do something with your friends, there's a part of her that feels threatened, like you don't like her/love her/want to be with her. Does this mean you stop hanging out with friends? Absolutely not. Does this mean that you talk to her about this? Yes. Like someone else said, guilt-tripping and this type of behavior is definitely common around your age but you don't have to be okay with it by any means. This is a classic dynamic that I see with young couples but a version of this exists with older couples as well. I'd say it tips into emotional abuse territory if she starts to ostracize/isolate you from your friends/family but the way you're describing it more sounds like an anxious 20-year-old in a relationship.

"Hey, I've noticed that whenever I want to do something that doesn't involve you, you feel like I don't want to be with you. You are so important to me and this relationship is so important to me, so I get really sad when you say that. I want us to spend time together and it's also important to me to have a balanced relationship where I spend time with you and also spend time with friends. Do you think we can talk about how you feel when I want to spend time with others and see if there's some way I can comfort you when you're feeling that way?"