I usually lurk here, but after reading I want to come out and post my response...
I know not everything I'm saying here is too different, but I do want to assure you of a few things.
In some cases, you won't like the way your weave looks right after the install. As someone who is rather softspoken, I understand how it feels to be nervous about telling a stylist that you're unhappy.
My first install was pretty bad. Lumpy, actually. But of course, I was too nervous to say anything to the stylist. Definitely do try at least sleeping with a scarf to perhaps flatten your hair out. I sometimes have to do this so my leave-out can "calm down"
Bobby pins and hair clips helped me out a lot too. Discretely placed bobby pins matching the hair color, and cute hair accessories strategically placed to make your hair more presentable AND cuter at the same time. There are a lot of cute headbands out there!
As a few ladies already mentioned, try styling the hair in different ways.
If you are tinkering with the idea of returning to the stylist, I would definitely not hold off - a lot of stylists will make corrections for free AT LEAST within the first week or two. A reasonable stylist should be able to take polite criticism or suggestions.
And lastly, do you perhaps have a friend or family member who could assist you in taking the weave out without having to pay to have it removed?
Whatever you do, no matter how unhappy you are with how your hair looks, do not forget to take care of your hair while this weave is installed. Even if you think your install is the most unsightly thing in the world, remember to still maintain the health of your hair throughout, don't give up!
Hair and appearances are a sensitive topic. For some of us, if we don't feel good about our hair, we don't feel good about how we look, and it can really drag you down. Please don't feel like you have to harm yourself and take your life. Hair, money, appearances, are NOT worth your health and safety.