I am always queued with the best players that know what to do in any situation , will always know what position you take and will totally headshot you if one pixel of your hitbox shows up on their screen. Why??? Can somebody explain?

I'm new to the game so I don't have any actual clue on what meta is like here, but from what i've seen playing against. Reyna seems idiotic. Tosses out a giant blind, that I either look at and shoot but get pushed same time so I die because...

I feel like there should be the option to change the skins you have equip at any point in the game (Like CSGO).