Alright this is gonna be short but sweet.

Saying no is honestly one of the most important things I've learned since swallowing the pill. If your default answer by nature is no, people will not only have more respect for you, but also value the rare occasion of you doing a favor for them much higher. Building your frame around a 'no' mentality also gives you more control over the relationships you have decided to include yourself in. It's all a part of staying aloof, distant, and seemingly uncaring. Practice it, every time someone asks a question just say no, before you even register what it is they are asking.