Hey Antonio,
Heres my advise to you:
I assume you get 2 days off. You might not know the two days but i'm assuming you get two days off. If i were you heres what i would do:
1. Start your own business. I started a painting business in college and made tons of money. The Lawn business is a good idea too. Or since you are computer savy start a business selling things on Ebay. You buy items on ebay cheap and re-sell them. Or buy items at yard sales and re-sell them.
2. Get your resume together and look for another job that pays more or the same as Walmart with better hours.
3. Get with a recruiter. They will call you with side jobs and with full time employment opportunities.
4. I know a few people that work from home doing customer service for companies like Direct Tv or Cruise lines. Basically you answer the phone and help people with their issues. You can do this as a side job as well.
5. Use your 3K as a downpayment on a lease purchase. You put 5K down and pay $405principle and interest then you add on taxes and insurance. So your paying about $550 a month. Then rent the house out for $700-$750 a month. The renter pays your mortgage and in 10 years you own the house and you get all the money. You save the extra in case something breaks.
Overall though i think you aren't desperate. You aren't in such a Jamb that motivates you over fear of failure and laziness.
Google: Mr. Money Mustache. Its also a blog that basically is all about saving money and living on nothing while living a fulfilling life.
There is no way to make quick, fast money! You can invest thousands but your return won't happen overnight.
You will be supprised how much you can save doing little side jobs, selling things, etc. Cut your cost of living and work to make your life better. If you hate your job so much then search the city for a new job!
Managers that hire want to see applicants that are on fire for a job. They want to see someone motivated and willing to do anything it takes to succeed.
Noone can make you want this or do this. I took a job out of college that didn't pay much and worked my butt off for a year. Then i transferred to a new higher paying job. Now i want to be financially free. So i've invested in educating myself in real estate investing and i'm constantly looking for ways i can make money to go towards my goal.
Good luck in your future endeavors! Hopefully you will listen to what everyone is telling you. What everyone is saying is this: You CAN do anything you set out to do! CAN'T isn't an option. YOU make your own destiny! You have to work and make yourself better. No one cares more about you than YOU!