Don't give up on college!
You say, "Four years of my life, plus 100K in debt for what? A career clerking at a book store? No thanks!"
I say, "It gives you the foundation to becoming a thinking citizen. It gives you validation for any and all future enterprises. Stop looking at it as an investment-with-a-mediocre-return. It's much more than a monetary investment. Also, this time in your life as a single adult is precious. Use it for college!"
Having said that, do college on the cheap.
Do everything possible to avoid debt!
If you're still in HS, take every concurrent enrollment class offered. Take anything. Keyboarding, whatever--it may fill in an elective. At $25 a unit, it is not only a tuition break, but you're saving room and board and time. (Not the same as AP. CE is guaranteed credit. AP classes are enriching, but for practical purposes, CE is better.)
Try to clep out of classes. You pay a tuition equivalent fee, but again, you save room/board/time. Consider American History or something you did well on in HS. See what they offer. You can get a book and cram for the test.
If you know a second language, get language equivalency points. Again, you also save room/board/time.
Look for specialty classes: An archeology or geology field trip that lasts just 10 days but gives 2-3 credits
.
Apply for scholarships--any free money. Pell grants.
Use only community college for years 1&2. (Get the Associates Degree along with, just in case.)
Consider housing hacks. Commute from home. For years 3&4 look for free housing, ie, nanny for someone old or young, be a dorm parent, trade housing for yard work, etc. Or rent a room only; study and eat on campus. Buy a used RV to live in and sell it after graduation. Housing is a pricey ticket. (My cousin bought an old house and rented out rooms to fellow students to make the house payments.)
Take a full load of classes instead of getting a job. Many schools let you take extra units for free. (Think of it like having a part-time job. Yes, it's more work, but you're getting some extra units for the $ you would make at a part-time job. And you save room/board/time.)
Keep it short. If you can, do it in 3 1/2 years. You'll save room/board/time.
Summers tend to be cheaper--both tuition and housing.
Don't own a car. Use public transport which tends to be cheap in a college town, or get a bicycle or motorbike.
Curtail fancy expenses--avoid road trips, cool devices, spendy shoes, concerts.
Special Note: Utah State University will give in-state tuition to any of our grandchildren as a legacy discount. Plus, we offer free housing in Mendon to any one of you trying to get a degree. And USU is not a shabby school. Numerous people you know and love have degrees from USU.