HI, Iam 35yrs Old And Married, Very Recently Me Had

HI, Iam 35yrs old and married, Very recently me had a sex with my wife and enjoyed our love.... Suddenly from 45days.. My penis has become lose and Problem with Sex. My penis has become so loose that I am unable to have sex? my penis is quite small. about 5 inches. but my major problem is now a days I have seen that there is no erection . It s always very loose. I used to do a lot of masturbating previously.and now I m totally useless. . Last week I tried sex with my wife, and failed to even enter my penis in her vagina because it was so loose.I am very much afraid Do I become impotent? there is no need to live. Please help me giving suggestions. How I can I make my penis muscle stronger? Somebody please advice