You don't need to act like a douche. You can just go out and talk to girls and be friendly with them and that will be enough to grow you massively and break you out of your shell. There's no need to be an asshole, just don't supplicate to people. Be grounded in your values and your life purpose. Sticking to your principles is enough to not be a people-pleaser. And you can do that while still being friendly and decent. You don't need to be obnoxious about it. For example, if you don't value drinking and a girl offers you a drink, just say, "No thanks, I prefer to not dull my mind with that." rather than telling her, "Fuck you bitch! Drinking is for losers." Notice that you don't have to be obnoxious to stand your ground or speak your mind.