Just do whatever makes you happy man, and don't worry if people here would disagree with something you're doing. Like, if you don't want your shrine up anymore then take it down, but it's not like you HAVE to take it down or something.
>I never took up good things like jogging or playing basketball or putting more effort into my studies (whether inside school or outside) because of my waifu and just wanted her to be there to reassure me of my shortcomings
There's nothing wrong with that, so don't worry about it. If she made you happy, then that's great. If she doesn't make you happy anymore, then that's fine too. Just go be happy and do happy things.