You are so beautiful! I am sorry you are feeling like this. I can relate! And it's no fun.
You know, what you are going through with your hair is absolutely natural. It's a normal part of the process of changing hair styles. At first, it's wow, because of the sheer change. But then you get to live in it, you notice the quirks, and need to do more tweaks. That's when you go back - to the same hairdresser, yes, that's ok - to make a good thing better.
When you speak to your hairdresser, indicate specific things:
"I don't like this bump here" ; "I don't want the flatness around there"; "this hangs too much like a wall, I want movement", "I want messiness", " I want edginess", "This flat part bothers me", "I want this part to look fuller/messier/piecy" That is a language that works better than pictures, because you're showing your very head, and where on the head. Now this said, do also bring pictures. Show pictures of the style, the vibe that you like, even if it's not quite the length nor the actual cut you like. You say, This, I like. Then you also make sure to show pics of styles that you DON'T like : "I don't want this." "This is not my style", "I absolutely hate this type of cut".
Also, my two cents: the hair wants to stay straight? Why fight it? Why not go all the way with the straight, all the way to the razor sculpted ends like in this pic:
http://0.tqn.com/d/beauty/1/0/.....h_hair.jpg
or
http://0.tqn.com/d/beauty/1/0/.....th_bob.jpg
or
http://0.tqn.com/d/beauty/1/0/m/w/84823289.jpg
Here are some pics of mussy lobs, for your inspiration:
http://0.tqn.com/d/beauty/1/0/.....t_hair.jpg
http://0.tqn.com/d/beauty/1/0/k/w/84452841.jpg
http://0.tqn.com/d/beauty/1/0/j/w/80905764.jpg
http://pinterest.com/pin/180003316327257848/
Lob with layers: http://pinterest.com/pin/180003316327422281/
Behaving lob with a twist: http://pinterest.com/pin/180003316327257852/
Personally, I think you would look amazing with hair even a bit shorter, in a real bob rather than a lob...:
http://pinterest.com/pin/180003316327422288/
http://pinterest.com/pin/180003316327257851/
http://pinterest.com/pin/180003316327587183/
Hugs to beautiful you!