The Into Games report highlighted barriers such as location, access to finance, reduced cultural capital and lack of networks which prevented people from lower socio-economic backgrounds from breaking into the industry.
It found that 59% of participants said they had been made to feel "othered" at some point in their career.
Will Luton, the founder of Village Studio Games, attended the event in Brighton and said he had "felt overt discrimination" due to his class.
He added he often found himself having to "mask" or "rework" the way he talked so he didn't "give away" where he was from.
Will argued that those like himself who had made it into the industry had a part to play in highlighting the problem, rather than suggesting that just because "they were in" the industry, it suddenly "wasn't an issue".
The report also suggested the gaming sector had a smaller proportion of people coming from lower socio-economic backgrounds (13%) compared to film and TV (29%) or music and visual arts (22%).
Nick Poole, head of games industry body Ukie, believed that while the talent was available, the "opportunity wasn't".
"If you're going to tell real stories, people who are young, gifted and broke need to be able to find their way into the industry," Nick said.