First, she's not your aunt, she's your neighbour. Second, I don't really know "how much" of confident stat you need, i haven't looked into these much when i played. Just try to choose assertive answers, it's not hard to guess which ones. For example, with Olivia\neighbour, make compliments to her, but don't be too direct. Look at her reaction after you choose something, if she doesn't like it then turn back and choose something else.
I suppose (if you don't want to watch Scott "growing up" and only care about assertive protags) you want something like Boring Douche Trainer. The few types of default alpha protags i really know (that's presented on this forum in more than one game) is either from dark fetish games, like rapist or blackmail simulators. Or from "pornodrome" type games aka fuck them all without any story or progression. Both can be fun sometimes, but become boring really fast for me. Not all are playing just to see H pictures. And coincidentally making weak and shy MMC into alpha wolf (or weak and shy FMC into alpha tigress) is one of the most popular scenarios that you can find in these games and not only games. Why? Because this is fun to read and watch for many-many people. Yes, even if you're assertive stronk guy irl. You as person don't need to be as shy as Scott to identify with him or care about him. Not how it works. This is just not for you i guess.