WHY try to achieve, grow, improve, etc?

For almost all of my life I've been the kind of person who, when I've wanted something but it involved what I considered to be a lot of effort, I always said "nevermind, I'll do without". Which is why I'm almost 34 never had a gf and am a virgin. It's also the reason why I have a huge gut, have a job that pays $11/hour because it doesn't require much effort on my part, and spend any time that I'm not working at home playing PS2 or on the internet so I don't have any friends. Even when I did have friends (both of whom were AFC losers just like me) it would annoy them that I would p!ss and moan about not feeling like hanging out and doing anything, preferring to stay at home by myself and you guessed it, play PS2 or go on the internet.
Okay, here's my question in a nutshell: for a person like me who for almost all of his life has been very passive and lazy by nature, and only makes a commitment to something (like a job) when it's literally a matter of survival, WHY set goals and try to achieve them, why try to grow as a person, why try to "do something with your life"? Why NOT just avoid life as much as possible, clinging to the dull old and safe because at least it's familiar, rather than trying to accomplish something that may or may not work out, and definitely will require effort, sacrifice, inconvenience and discomfort? Is there some reason why it's NECESSARY to try to grow, learn, achieve? What's my motivation NOT to just waste my life away?
For some it may be natural as can be: "I do it because that's just who I am, I love challenges" or "I do it just because it feels good to accomplish something". But this is just the way I'm wired, at the present anyway, that avoiding unpleasant circumstances motivates me a lot more than seeking pleasant ones. Call me a loser, call me a pussy, etc. I already think that of myself so that's not going to motivate me either.

You only live once. We’re all put on this world for whatever reason but I don’t believe we have any obligation to it. We could as easily choose to do the same things over and not bother to develop ourselves in anyway, and that is not wrong. But essentially, we all live for ourselves, so we each have to choose our values, desires, and goals individually. If you’re fine with what you have and you don’t want anymore, then who can complain?

One word of advice though. I hope you’re not overlooking any life potentials. Take the analogy of the fish who lives its entire life in water. Would that fish even understand the concept of water and wetness if it’s constantly surrounded by it? Basically, it is easy to be content with the status quo, such as playing games all day and living a life in solitude, out of the assumption that nothing else is worth it. But how can you really know what’s out there if you haven’t at least given it a shot? You could live a solitude life, but ask yourself, there’s a whole world out there, wouldn’t it not hurt to go give a few things a try? I mean I think you know where your current life will lead you anyways, so why not try something different. Wouldn’t hurt. Again, you’re given this whole world to explore and you only live once.

But an advantage I think you have, assuming you’ve had this attitude for sometime, is that you probably aren’t filled with societal preconditioning like most other people. Stuff like how most people are conditioned to enjoy certain mainstream things, or think a certain socially acceptable way, or express nationalism and the like. These people are generally acting out their biases, so although they may be more outgoing in life than you, they can be thought as merely executing a preconditioned mentality. You, on the other hand, have avoiding a lot of these things and I believe you’ll benefit the most if you should engage the world. You’ll see the world without bias and you’ll be more a critical thinking. And thus, I think you may actually get more out of the world objectively. The downside is, you’ll probably get fed up with how society works and how ignorant some people are. But, after realizing this, what you do from here is anyone’s guess and I’ll leave that to you to decide.