<human>: I suppose the title more or less sums up the situation, but I'll fill it in with a bit more detail.

Two years ago, I was told through a friend that the Alumni Association of my university I graduated from were looking for a few people to serve on their Board of Directors.  I enjoyed my time there and was very open and excited to the opportunity to serve there.

The first year or so as I was more or less just an interested participant was fine enough.  I always felt they honestly got very little done and wasn't entirely productive, but it was at least something fun to do every once in a while and offered something to put on a resume and had networking opportunities.

In my second year, things have gotten progressively frustrating.  As I've attempted to become more active, I've found that just about every suggestion I've had has been entirely dismissed or ignored by the group as a whole.  It's very frustrating to try to contribute but only be ignored.

Recently, I'd finally had a suggestion gain the support of a lot of my peers in the group, and I was nominated as lead of a group to put together an event that I was very excited about.  But then the university sponsor of the group changed every single goalpost, and now it's something else entirely than what I originally suggested.

I'm really frustrated with all of this and at this point don't want to really even bother with the group anymore.  But I don't want to harm any professional relationship any further, plus my term is coming to a close in the Fall anyways.  I'm mainly concerned that all the frustration I'm dealing with is inevitably going to burn bridges, which isn't worth it.

Any idea on how to handle this?

Summarize the given text in a few sentences.
<bot>: I'm having an extremely difficult time dealing with the politics of a university alumni association board, and I'd frankly rather not deal with it anymore, however I don't want to burn bridges as I back out.