Masturbating doesn’t feel good

I can’t seem to pleasure myself no matter what I do. I’ve tried different positions and strategies but it doesn’t do anything for me at all anymore. I’ve tried focusing on clitoral masturbation but it doesn’t feel good at all. Vaginal sometimes feels good but it only last 30 seconds or less before feeling like nothing again. I’m 18 and single and don’t have any “toys” so I feel like I can’t help myself but I’m getting pent up.