Sorry to just ramble on about my thoughts here, because up front I can say I've never done EMDR! But... I've read a lot of good things about it's benefits, it has proven effectiveness, however from what I've read you need to be emotionally present with the trauma feelings during the EMDR for it to work. When you say you feel like you're forcing it, my guess is you are experiencing some issues either connecting with and feeling safe with your therapist and or disassociating (not able to be emotionally present with the pain.)

I am big on disassociating I've found out in therapy. Being an ACoA isn't "no big deal." It doesn't need to be a docudrama worthy trauma to bring about a strong emotional reaction (but there are people who have trauma's they are resilient to, it's a crap shoot). The fact is for children, troubles with parents ARE traumatizing in nature. You were a vulnerable helpless child once, dependent on your parents, beholden to them, and alcoholics are not stable at a minimum. Being an ACoA means you probably had a lot of fear in your childhood, at least for me it did. That kind of pain gets buried so we can go to school and live lives, but it can be hiding there under the surface, causing problems and spilling out in many ways, ways you might not even be aware. We become pros at tucking the bad memories and feelings away, intellectually discounting them with thoughts like "well I know why it happened, I should be over this" etc.

Parental issues like alcoholism can also frequently lead to attachment difficulties in kids, then problems compound and you are mildly afraid of people, repressing this pain, and hiding from your own emotions because it seems like the "right" way to act. But the truth is... there was a loss that must be mourned, and a pain that maybe you are just so used to pushing down you may not know if it's even there. I think it takes practice learning how to access the emotion and then be able to access it in therapy and then tuck it back away again to go on with your week until the next time. My advice would be to simply tell the EMDR person you feel like you're faking it. That might tip them off to the disassociation or whatever might be the cause of that, in which case you can work on ways to improve it.

(Take all of my theories with a grain of salt, consult a therapist, note that I am not a professional. LOL!)