I'd like to start by saying that I really don't want to offend you, but I am going to pick apart some of what you say. I do this with the best of intentions and offer you some reference videos that you can watch if you really do want to learn about evolution.
But that part is down to you. The evidence is there, provided that you don't decide to turn your head away from it. See end of post for vid refs.
dnnydllr said:
I don't mean the part where a species changes over time, as that is quite evidently true, but rather that all species came from a common ancestor through the process of speciation. I quite frankly don't see how this could possibly make any sense.
Then your teachers probably haven't explained it clearly enough. There is no difference between macro and micro evolution, merely the amount of time required for noticeable change to take place.
Please see this video, its a tad belligerent but its connected to the ongoing youtube battle between the god squad and the evolution crew, it explains much better than I can: http://www.youtube.com/watch?v=Z3SAGDZXLxI
dnnydllr said:
Even through billions of random mutations, I don't think bacteria could turn into something as complex as a human.
I don't want to be a dick, but there are people a lot smarter than you or I that have worked on this for most of their adult lives on this. Evolution is accepted as scientific fact whether you choose to believe it or not. The only higher state of proof that exists is a mathematical proof ie 1+1=2. The only people who don't accept it as fact are people who instead put 'faith' in unprovable bronze age superstitions. I don't want to insult, but this is where ultimately it is your choice what you believe.
dnnydllr said:
And why don't we see any animals changing species today? You'd think that at least one or two should be crossing over around now.
You don't see it because you don't get to live that long. Sorry, that's mortality for you. Actually, having said that, if you observe the consequences of selective breeding programmes then you will see evolution in action. It takes a handful of generations to breed wild wolves into a life form very close to the German shepherd dog.
dnnydllr said:
I don't know, it just doesn't make sense to me, and the fact that scientists blindly accept this as fact really grinds my gears. Every time i say something against it people immediately assume I'm looking at it from a creationist standpoint, when I really am not. I don't know if anyone else has opinions about this, but input would be very nice.
That may be because you make the assertion that "scientists blindly accept this as fact", and that sounds an awful lot like creationist garbage. If you really want to understand evolution there are some excellent educational videos I can show you.
This first one is a favorite of mine, its quite old (1991) but brilliantly delivered (consider that since it was made the evidence has stacked up further): http://www.youtube.com/watch?v=F8xFaNGzgTQ
It is the first of 7 videos. I wholeheartedly implore you to have patience and learn from the outstanding lecturer. I won't mention his name here for fear of scaring you away (in case you are religious).