I think it's normal to feel weird and annoying at your age. 18 is a tough age to be. Whenever you ask an older person if they would want to be 18 again they say no. So don't be too hard on yourself.
I think your father's feedback is not appropriate for his age. Parents should be supportive and helpful, not critical and hurtful. Is there someone else who you can trust to ask for some constructive feedback that may help you?