Am I being paid too little?

Basically title says it I work in a pump fab shop making these pressure tested heads I’m 20 abt to be 21. Been here a year and I had to argue with ownership as to why I deserve atleast 19 and still I get 18, I deal with a lot of BS here and honestly I’m not jus a welder I do whatever they need but welder by trade. Got no problem doing electrical troubleshooting or fixing lathes but they’ve also given me ridiculous deadline to meet while doing other things. I’ve already asked for more and they said it’s not in their budget rn. Should I leave?