AITAH for wanting to be alone

am i the asshole because i find myself to be more of a introvert however ive somehow managed to get a girlfriend and ive told her i like to be alone sometimes especially after ive been with people. Today the reason im asking is because i had been around people all day and with her for the last 4 hours and she wanted to play minecraft on call when i have gotten home but i told her id rather spend some time alone and that she could play with her friend she told me its fine but i could tell she was upset and she hung up. i dont know if im in the wrong although ive already told her about this and i dont do it often i just tough it out no matter how tired i am.