You're not the only one to deal with this. My daughter wasn't interested in solids until she was nearly 8 months. She, too, preferred mama milk straight from the source, although people other than me could get her to take pumped milk from a bottle. Is it possible your son would accept a bottle from someone other than you?
The interesting part is that when she did get started, she completely bypassed baby food (although we did discover that she could spit it a really long way) and went for softened, chopped, or coarsely mashed up versions of what we were eating. Her first successful solid food was rice - not rice cereal, but the real thing. To this day (she's 7 years old now) she does not enjoy smooth foods such as apple sauce or mashed potatoes. Perhaps your little one is put off by the texture of what you've been offering.
Hang in there just a little longer - he may grow out of this in another month or so. And try changing the texture of what you're offering - that might be the key.