How do I tell my parents I don't want to go to grad school?

I'm pretty sure I don't want to go. I want to get a job and move into some place with my bf. I've thought a lot about it and really think it's the right choice. When I started college I wanted to get a master's degree after & I'm a little interested in a couple grad programs but I'm tired of school -I've still gotta get the strength to finish my last semester -& I wanna work and earn a living so I can pay off loans & help put my siblings through college & start my life. My parents think my goals when I was 18 are the same now and my mom told me "You can't just get some job meant for high schoolers after all we sacrificed to send you to that school." I'm looking into being a park ranger -it pays more than min wage & most have associates or bachelor's degrees, and it's not the only job I'm lookin at. Also I'm really grateful they paid for my bachelor's education but they'd made it seem like college was my only choice -when I was in high school my parents & teachers made it seem like if I didn't go to college I'd be stuck working at McDonald's the rest of my life. So now that I know I've got many fruitful options, I wanna make the smart choice. UPDATE: I told my mom today. I might hear complaints from my relatives later on but to my face she handled it well.