yep. At least do 6 percent, but at only 21k gross, I would probably not do more as you will not have much money to pay bills and keep up the mercedes. I am 24 and I also contribute 6%. I am going to bump it up to 15 as soon as I get my fully funded emergency fund, but that extra 9% is going into a roth IRA.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual