Hi,I am 27,I used to master bate a lot,now I live with my gf about 3 years,we have regular inter courses n I master bate as well.now I ve notice that I have wrinkles on my penise m it s very loose, n I can t go for the 2nd round that easily that I used to do before.now I m very worried.it looks so small when it s not erect but when it erects it is ok.i have good size about 6.50 inches.i am circumsised.plz help me