Are you still looking for "The TRUTH"? Because unless you're the one doing all of the research initially, and none of us can be the foremost expert on everything, you're always at the mercy of someone else. Things like evolution have a ton of evidence so you know it happened on some level. Nobody knows what started everything conclusively, and if there's a god that kicked it all off then I hope it isn't the one in the bible that is a genocidal nutjob in a book with a myriad of issues, and if you want to put faith in that god fine but you could just as soon put faith in the god of many other religions so who cares.
Like Anders said, it's perfectly okay not to know everything. It doesn't have to impact your life. I know enough but don't care to know it all anyway. Life is more fun with a little bit of mystery, and if something really bothers you then investigate it. But you don't have to let the search for something that cannot necessarily be found on every little thing drive you crazy. One of the things that I had to learn is that I'm not always in control, stuff happens, and all we can do is try to react the best we can.