You decide to concentrate on linguistics and not double major..
A wise choice. A double major may offer too many distractions. You sail through your Syntax classes, you rock in your Semantics classes. You are becoming a consummate linguist.
On the other hand, you are also getting a little tired of school. Maybe, just maybe, grad school is overkill.
Accept the inevitable grind and go on to grad school.
Tell everyone grad school is not for you and just try to get a job.