why DID we evolve into humans?

i was just thinking - why did we evolve into the state we are in now-i've read topics saying that we no longer need to evolve as we just "invent" or make what we need - such as to fly we created planes, to help with bad eye-sight we made glasses, to combat disease we invented cures.why did we need to evolve into humans (if you believe that we did). what do apes NOT have that they needed to become humans - and if it is they needed ability to talk - why did they just not have voice boxes as they are now - if it is because they wanted to walk upright - why?!why did we even evolve into apes from the creatures we "were" before - if we originally were underwater creatures why was there earth and why did we leave the water, also why have we not stayed consistent in being able to do things that past "ancestors" were able to do - from apes to the first origin?!views on this would be appreciated

"I'm not sure if I answered your question, but it did seem there were some mistaken ideas about evolution in your question."care to elaborate which they were and i'll explain what i meant by them? thanksmy understanding is that there are 2 forms of evolution - one is natural selection - one is actually changing form or "producing" from nothing and from what we don't know-something that we need -for example- if we didn't know what voice boxes were - why did we want one - animals communicate perfectly with eachother-why did we need voice boxes?when i ask why we evolved into humans- the answer that it is from natural selection cannot be true - as that would suggest that humans were already alive at the time - humans being stronger and able to survive in that environment and so they survived.
darwins natural selection states that there were species, all different kinds in that species - for example giraffes (though i think this theory was put forward by someone else as well), we had long necked and short necked ones. the long necked ones survived.to say humans came from natural selection cannot be true - as they would have needed to be alongside other animals and needed to be the only species to survive in that environment that they were in.if humans "evolved" that suggests that apes/chimps or whatever animal it is nowadays that we came from, changed its features and somehow produced features that it knew nothing of and was not in need of (otherwise monkeys would not be around today). why did the monkeys become humans if they are perfectly capable of living as they are?also - if we so wanted to do so many things that we can't in our natural state- why did we not just evolve them-such as wings to fly, gills to stay under water longer.
why was it that we only invented contraptions to do these things within the last century or 2?!