R&P: Prove me wrong...are good SCREAMERS necessarily good SINGERS?

Good day to you all! ^-^ I'm feeling particularly sad this afternoon
(which I'll be forced to explain why) so I don't feel like my usual
optimistic self anymore..:( Anyways, I just hope you aren't down in
the dumps like I am today...onto the question!

So this is a trend that I seem to notice a lot in metal. Prove me
wrong if you wish, but many screamers of the heavy metal genre end up
being pretty decent singers once they're *exposed*. Sadly, I've only
come across a couple whom I've actually heard said *sing*, so anyone
with a degree in music or good foundation on singing criteria or
anyone else who wants to give an opinion ---> THAT'S YOU YOU YOU :D
Please prove me wrong or right on this theory.

Duhhhh... the only decent song I can think of at the moment is by
Children of Bodom. Alexi sings clean vocals on the cover for Rebel
Yell: http://www.youtube.com/watch?v=L0r9MEa-Vfg

Haha, and Fenriz from Darkthrone is quite a decent singer as well!!
???: http://www.youtube.com/watch?v=sMp6tsTE66A

And this'll be quite boring because I just asked a question on Alcest
but Neige is a very good singer as well:
http://www.youtube.com/watch?v=81piPtioDDQ

BQ: Now to tell you all why I'm *down* this afternoon because I find
you guys much more caring than the friends section and plus I love you
all! These past weeks, I've been undergoing training with my coach for
tennis next year. Today, my usual tennis buddies were out so she let
her *star* pupils rally against me. Usually I'm fine with going
against someone who is better than me, but these girls were so
good...I don't know how horrible I looked next to them and I don't
mean to get a big head or anything but I'm actually pretty good at the
game myself!! My self esteem just went downhill with them and I was
just so unenthusiastic about the game that I sat out for the rest of
the rally and didn't hit a thing. I've known from past efforts that
playing with someone better always helps you improve in the end but I
just feel like an idiot next to these girls when I know that I have
the skills to do so much better...pretty please advice?

BQ2: What if I changed my pic to Fenriz from Darkthrone?

Bybye! :D