I would call a reputable mortgage broker, or your bank. If you have friends or family who have a mortgage ask them if they can recommend someone to you. Stay away for getting pre approved online. Talk to someone in person. A good lender will tell you if you qualify for any special programs, or things like that. If you still need help give me a call and I can set you up with someone we use in our company. 724-994-1318. I am a licensed agent in PA.

First off, don't give up!
I'd start here:
http://www.hud.gov/buying/
This is the u.s. government's Housing and Urban Development website, they have a lot of useful information and links.

The HUD website has a list of "HUD approved Housing Counseling Agencies" in Pennsylvania; one in Pittsburgh is:

Fair Housing Partnership of Greater Pittsburgh http://www.pittsburghfairhousing.org
412-391-2535-201
peter@pittsburghfairhousing.org
2840 Liberty Avenue
Suite 205
Pittsburgh, Pennsylvania 15222

Services:
- Fair Housing Assistance
- Homebuyer Education Programs
- Mobility and Relocation Counseling
- Money Debt Management
- Mortgage Delinquency and Default Resolution Counseling
- Predatory Lending
- Prepurchase Counseling
- Renters Assistance
- Services for Homeless