Your worries are very natural and real and we have all had them,believe me on that one!
But what has been said is true,no bull!
These things are so far removed from what i thought and understood wigs to be.
You have to wear them to understand that and you very,very quickly forget you have it on.
If you have your density,color spot on with a good cut in and also a clean attachment which is so easy it is childs play, then there is not a cats hell in chance for anyone,and i mean anyone, even suspecting that you wear,even up close and personal.
Unfortuanatly we can all tell you but you have to bite the bullett yourself and wear and pretty quick you will feel a bit foolish for your concerns and worries.
That is in no way disputing or dismissing them because, as i say, we all had them and we all felt them for the first time.
I remember after i got it attached and i went out for the first time and walking down the street i just kept my eyes open to see who would look or worse point or laugh but nothing.
It really is true no one gives a shit really and you will be a bit paranoid for the first few times you go out and about but again that passes without you even noticing.
If you do find yourself worrying too much after a few days or weeks then reconsider if wearing is for you because to wear successfully you have to forget and live your life without even giving it a second thought.
That's the secret and all i can say is that you do soon forget you have anything on your head it is that natural.
Very best of luck and let us know how it goes for you and please stop trying to worry too much,nothing in life,especially hair is worth getting too worked out about!