If you honestly think your worth more then ask for it. I spent a lot of years working for a_ _ H_ _es, some times getting paid good wages sometimes not. Being at the mercy of some cheap boss sucks. I learned to turn the table, marketing my skill level and experience and not being afraid to ask for what I think I am worth .
Good employees, with a drivers lic. and drug free are rare and worth good money, if you have skills to boot, show up on time, take responsibly your worth your weight in gold.
A little trick I learned is to make your self indispensably to the company, then lean on them for more money, But be carefull and don't burn those bridges.
Also be carefull, I have seen lots of people who thought they were indispensable end up fired, and easily replaced.
You have to beleave in your self and have confidence, and know your worth more, to get more.