Is there any hope in me buying a home?

My soon to be wife and I are trying to buy a home. I have been turned down by everyone. My credit score is 521, according to credit karma and 611 on credit sesame. I keep hearing my problem is I have never had revolving credit. I have never owned a credit card or had a loan. I don't make much money, 22,000 a... show more My soon to be wife and I are trying to buy a home. I have been turned down by everyone. My credit score is 521, according to credit karma and 611 on credit sesame. I keep hearing my problem is I have never had revolving credit. I have never owned a credit card or had a loan. I don't make much money, 22,000 a year but i have absolutely no bills. The home we found is only 30,000. Is there anyone who would help me? All advice is welcome! I'm so stressed about this! We currently live in separate houses with family and it's just hard not being together as a family with our son.
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