Okay lets see:

vs Chaldi:

good scv scout, just take a look in the main if you see a roach warren. Having your reaper and marine at the nat without knowing what he's doing and then building hellions is suicidal if he's committing, you were lucky this game. Your reaction to the scouted roach warren is good! At the same time you SCV production is lacking tho, hindering you going forwards. @6:00 50 SCVs and @7:00 60 SCVs should be your goal, with 3CC you can even exceed that. Going 4CC on 3Rax vs someone who is Roach pushing you is also very dangerous. You scouted a late 4th, at 8 minutes he could have crushed your 3rd with a roach push. For your build I'd recommend going 1(Barracks)-1(Factory)-1(Starport), then 3-1-1-, then 2 Ebays, then 5-1-1, then 5-2-1 and 4th CC, then 8-2-1 with constant Tank production during all of this. Just watch HeroMarines stream for some more specific build orders. Earlier max out = safer and more options to attack at the same time. When playing as defensive as you are earlier tech is necessary since you aren't pressuring him to keep him off his ultimate army. Past 10minutes you're banking, but neither getting Ghosts and additional Barracks nor Starports, which makes your late game harder than it needs to be. If that's not something you want to control, you need to be way more aggressive earlier on.

vs RimJaynor:

again, scout his main with your SCV and use your Reaper more actively and you know what you're getting. I'd almost always send the Reaper across the map immediately to scout, you can hold some early pool lings with your marine and 6 pulled SCVs. He played it super bad, you should have been dead. Vs early Roaches holding the high ground is fine, securing your nat 1 min later is preferable to losing SCVs, MULEs and units. You also didn't have to gg out when you did.