Hi Sir ...i Want To Ask Dat Why My Penis

hi sir ...i want to ask dat why my penis do not get fully erect after touching it also..earlier it got to be erect even at sight stimulation but now it hardly gets fully erect..and i also want to tell u dat i practised TMS way of masturbation..is dis the reason..please sir give me a solution..i hav been in great tension since last few days..will i be normal again..? is dis a serious thing..? my age is 18 yrs