A professional interpreter has no place to look down on any client's language abilities. The terp should adjust to your abilities as much as possible. Just be honest and up front about your limitations at the time of making the interpreting appointment, and when first meeting the interpreter.
You might be able to contact a local interpreting agency and request a language skills evaluation to find out how much value you can get from interpreting services at this stage.
Are you involved with a local Deaf services government agency, or a public social Deaf group? It would be beneficial to you to take advantage of local resources with real live people. We have an excellent group in our area but not every area does, sadly. I hope your location does have a non-judgmental welcoming Deaf community.
