Is it just me or does the MC look way older than they're supposed to be?
Yes, it's been turned into an inside joke. The characters in the game will make the same remark.
Ok, but we don't have all the info needed, because even in easy mode, some options always give positive options and it's not as easy to guess whether is one or another. See, for example, I work with her, I tried to gain most points with her, and even like this, I missed the changing room scene.
I don't like to force things with the mod, but when I can't see clearly where or what I have to change, I feel the need to do it.
Having said this, I find your game interesting, different, but the playability it's somehow not intuitive sometimes.
Without knowing each of your choices I can't say exactly which options you should change to get your desired outcome.
But we can look at it more generally, which may help if other people are also getting confused.
Affinity and Persona are two separate systems for stat tracking. Besides just the stat tracking, there's also an action consequence. Choosing to say or do something vs keeping quiet and not doing something is equally as important as just looking at the stats you get from each option.
Stats are easy to gain and lose. You can make up the stats on the next choice, but the girl will remember which choices you pick along the way.
In the screenshot you referenced one option had 'Persona + 1' and the other 'Affinity + 1'.
What does 'Persona + 1 mean? It gives you one point towards being a nice guy.
On Easy mode, Nice Guy is between +1 and +5 on the persona scale. Bad Boy is -1 to -5 persona. You can't go beyond -5 or +5. So if you're a Nice Guy at +5 already, that persona point doesn't actually do anything.
Remember that playful bad-boy choice later in the scene? If you want to pick it, you need to have enough nice guy points to sacrifice without becoming a bad boy.
What does 'Affinity + 1' mean?
If you're wanting to pursue a character you need to have High Affinity. For Keira on Easy mode, that's 65% of available Affinity points. (On Hard mode it's 90%)
Each character has a different high-affinity threshold. For instance, on Easy mode, Natasha's high threshold is 40%, Teri's is 25%, and Amy's is 85%.
Since there's an 'Affinity + 1' choice, it means both options will increase the 'available' Affinity points by +1.
If you don't pick the Affinity choice, you effectively reduce your Affinity with Keira because Affinity is a percentage of the 'available' Affinity points you could have earned.
Example, if there were 10 affinity points available but you only scored 7. You would have 70% Affinity.
This is why I say it's up to the player to decide.