playing with myself

i feel weird. i’m 16 and have never “finished” i play with myself a lot and have used lots of different things to get off. i feel like my body just doesn’t work right and maybe i won’t ever finish. i feel for myself i am not ready for a partner in any way sexual either. i’m just worried i can’t ever do it. is it normal for a 16 year old to not be able to finish?