Not knowing what you looked like without it, you look perfectly normal to me and I can't see any joins.
I couldn't tell you where it started or finished.
There is no indication its anything but your own hair.
I really like the messy casual style.

The only thing I noticed is that the hair appears 'clumped' in places.
This may just be the picture, (as you said) but you also said you got some glue in to the hair.
That can cause clumping.
Just to break the hair up and even it out, you should try a 'pick comb', pic attached.

Also you could spray some C22 on to a small towel and gently rub the roots of the hair.
I may be wrong about the clumping because it doesn't appear to be evident in the picture where the hair is wet.

You should really feel very confident. You've actually done a very good job for a first attempt and it will get easier.

Well done!