Pls HELP. Can't get/stay hard without using my hands or physical stimulation and sitting position

Hi all

I remember when i was young (16-19), I got boners very easily by just being aroused. Hard one at that. However, after about 11 years of PMO (i'm now 28), I realized i can't get and stay hard except i use my left hand and in a particular sitting position . Also this happened when i was with a lady, I was very horny but couldn't get hard except i use my hand to get myself hard and it doesn't stay hard except i continue using my hand. This is scary as I have only tried to have sex once in my life. I have a new gf now and i'm scared i would dissappoint her.

Can NoFap and a reboot fix this. Is this fixable on hard mode. I am ready to quit this lifestyle. Thanks. Ignore my 500 day counter till it gets updated. I have been away for years and just realized how big of a problem this is and now willing to start again

 

Yes, i plan to be committed. Do you have experience solving this particular issue? One thing i have also nticed is that i can't get or maintain an erection lying on my back. It dissapears once i'm on my back (this would make doggy and sex with the lady on top impossible). So firstly, i need my hand to get and maintain an erection, it's not as hard as before, only happens in my masturbation sitting position. And secondly, I lose erection while standing or lying on my back. I am willing to go cold turkey and be resolute in hard mode in solving this. No looking touching thinking. I just need assurance that this would fix it and that i'm not damaged. Thanks