Maybe your best bet is genetic engineering / genetic modification then. At least in this lifetime - I don't know what your stance is on things like reincarnation.
I'm not out to escape my humanity. I'd grab the slightest chance at immortality if I could get it, but as long as my current body was healthy, I'd be happy to keep it. The human ego is fragile in some ways, but can also be a lot more resilient than people give it credit for. I'm not ready to jump ship on it yet - I'm having more fun seeing if I can tame it and shape it to fit my goals. A lot of my personality is tied up in aspects of my identity that are part of being human. Though I'm not necessarily human at the core - all that's needed is a will, and that could be transplanted into any form that could think, feel and take action.
So I care more about mental transformation than physical. That's why the interest in psychology, because it's one of the best tools I've found for transcendence. Though there are other paths - various religions, spiritual disciplines, etc.