This all boils down to flawed ideas regarding game theory, and consequently how to maximise personal happiness, wealth, and status. Even if everything is a competition, there are multiple situations where genuine co-operation is the move with maximal personal benefit. The real way to maximise personal profit is not to steal your neighbours apples, but to genuinely befriend him and have him give you buckets of apples.

You're like a thief who thinks that the optimal way to succeed as a thief is to steal everything all the time. So you take a vase from your parents house, and a bottle of shampoo from the corner shop, and the shoes of a passed out acquaintance etc. The underlining idea here being that if you do this long enough you will have stolen everything and hence own everything. Obviously in reality you're just shitting in the well you're drinking from, and eventually the cops will find you with a pile of trinkets and no one to pay the bail.

The only negative I can think of is that people generally don't like me, even though I want people to like me.

If what you say is genuinely true, then nobody likes you. I mean this in the literal sense of the word. You might have social circle, but I will bet my left testicle that not a single one of those people genuinely like your company. You might think that people don't recognise what you are doing, but they do. Having a constant toxic effect doesn't go unnoticed. People might not see the individual moves, but it all builds up when you're basically conditioning people to avoid you.

In essence you're playing a highly predatory short term strategy, thinking that it will work forever. In reality it will become more and more difficult to exploit people once they start seeing you for who you are. You lack the imagination to see the bigger picture and long term benefits of mutually profitable relationships and contacts. Not only are you unethical but also fundamentally wrong in your theories regarding success in life.