Hello. First of all, stop being retarded and skipping all scenes and tutorials. Second, check the tutorials in the HELP menu. Third, you have Girls' levels and Quests. Follow those.
If you have any doubt, check the HELP menu inside the game.
You have to reach certain affection with a girl and then you have to follow her tip to level up, and you continue like that. Just like any freaking normal game out there.