Supervisor and GRA roles in submitting a grant
You seem to be having two issues. The first is you are not happy with your GRA experience and the second is you are confused about the grant. It is important to separate these issues when talking to the supervisor and only bring one issue up at a time. Sicne you questions focuses on the grant, so does my answer.

While it is too late now, before starting to work on a grant or any research project it is important to define the roles of each team member. You then need to review these roles frequently as the project progresses.

There are two possibilities for the grant. The first case is that the grant includes funding for you (or someone like you). In this case you need to have a friendly chat to discuss what your role will be if the grant gets funded. This should be fairly painless since you (or someone like you) is listed on the grant. The second case is that the grant doesn't include funding for you (or someone like you). If this is the case, then it is pretty clear that you are not really included on the grant. If the grant could have included funding for you, but you were not included, you should have raised the issue as soon as you realized. This is potentially problematic and it is worth discussing with the supervisor why you were not included. If the grant could not have included funding for you, then it is not clear what the issue is.

Whatever happens, you should have a nice civil conversation with the supervisor.