I won't repeat anything the others have mentioned, but here's one I haven't seen addressed. The first line in the chorus: Whenever I meet that special girl. Using "that" implies one specific person, so I suggestion considering using "a" instead. Also, since I am no fan of calling adults "boys" and "girls", I would change "girl" to woman. It adds one syllable to the line, but the extra is a final weak beat which should be easy to include.
The second line is okay as is, but it might be just as good, possibly even better (but I don't guarantee it) if it went, "I always tell myself that she's the one." Which would then give you:
Whenever I meet a special woman
I always tell myself that she's the one [or: "I always tell myself, yeah, she's the one"]
But then it all goes wrong
And once again I'm left waiting for the sun
Yeah, I'm left waiting for the sun
So, just a couple thoughts, in case they appeal to you.
Vicki