VOD 12 - u/gustamos

I omitted a lot of nitpicking because you're only in Gold. I focused mostly on the important things you should be aware of.

As requested, I only reviewed the first match.

3:33 - Nitpick: You're in Gold, so it doesn't really matter, but generally, don't be the first to charge out of spawn, since you can get spawn killed. Let your tanks go out first
3:42 - Pointless DPS
4:00 - Questionable nade
4:01 - Your teammates are all yellow on the right and you decide to focus Pharah for some reason
4:08 - Since they're running Pharah, stay very close to the left wall (the wall with the choke)
4:12 - Pointless sleep
4:22 - Scope heal Roadhog
4:48 - Abort
5:02 - You didn't have to expose yourself
5:06 - Look before nading
5:14 - Stay close to the wall; you're exposing yourself
6:15 - This is the worst place to stand since the enemy team has a clear line of sight on you. Just stay close to the wall
6:20 - The enemy team accidentally walls off Zarya. You should sleep and engage her here
7:03 - Go for the point, right now
8:07 - Throw a nade down there
8:10 - Way too late
8:12 - Bad sleep
8:40 - Soldier's yellow on the right. Glance to check his health
9:15 - Just regroup
9:19 - Don't stand here, really
9:25 - Totally pointless engagement by yourself
9:36  - Rein doesn't have shield up; stay out of sight from the path
9:43 - Questionable nade
9:44 - As soon as you heard the enemy team Nano somebody for some reason (behind a Mei wall lol), you should've just told everyone to back off and let them come out
9:47 - Sleep only after you see your target
9:54 - If you Nano Soldier, pocket heal him from inside cover
10:09 - D.Va asks for healing but you ignore her
10:12 - Abort immediately
10:23 - You should've attempted to sleep her
10:55 - Pointless nade
11:00 - Poor sleep; you should've taken your time with this one
11:13 - At 23 HP, you should be staying far outside the entrance
11:24 - Just Nano your Bastion
11:40 - You could've won this fight if you just Nano'd Bastion
14:14 - I would've attempted to throw a long range nade over there
14:17 - Bad throw
14:34 - Bad sleep
14:47 - Unnecessary nade
16:06 - Attempt to long range nade here
17:08 - Questionable nade
17:33 - Sleep him on the second floor
17:42 - Being this close to Pharah, either 1v1 her or run outside of the point and try to hide behind the wall
19:27 - Not the greatest nade
19:40 - You didn't have to go down
20:02 - Pointless nade
20:22 - Pointless nade
21:01 - Unnecessary nade
21:34 - Tunnel visioning a bit. Look left to see your other teammates as well
21:20 - Prepare to Nano Winston
22:30 - Do it now
22:41 - Nano someone, anyone

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Additional Remarks
- It's important to keep in mind that both you and your team are at fault for this match. Because your teammates are Gold players, none of them really know how to position safely nor do they know how to push. You can't really do anything about that. However, that doesn't meant you should keep standing in spots where the enemy team can see you and shoot you.
- There are lots of issues I'd nitpick on, but I omitted most of them since the biggest one you have is positioning and knowing when to back off from lost fights.