hii dear relax as much you become anxious it leads to more problems 1st be clear that masturbation is not a bad habit and it does not leads to any problem certain factor affect it like 1st is life syle stress and busy life style make u fatigue and secondry to this it makes less desire in sex and erectile problems identify stress area and modify it this will reduce your anxiety and able to erect easily so stress free lifestyle and mutual communication will help third is physical health routine check up and fit physical health is necessary psychological soundness is must so relax no need to worry just take help from erotic material and media ,, when u will full desire and than you will achieve full erection at this age you do not have any physical disease so take care thank you