why can’t i feel love?

for a while now, i’ve been having difficulty feeling emotions, especially love. i know there’s something wrong with me and it’s really frustrating me. especially since i have friends and a gf that i care about so much. but i can’t really seem to actually love them. i care about them and want them to be healthy, safe, and stuff like that, but i can’t seem to feel love. i remember when i was little, i felt love and it was such a strong emotion. I don’t even remember what that emotion feels like anymore. It’s making me feel sooo guilty since i know that my gf loves me so god damn much. and it’s hurting me a lot since i know that i can’t love her back the same way, even if she thinks i am. and i can’t even tell her everything about me partially because of this. i don’t know what to do about this and i just really needed to vent this out.