I will not respond to your reasons beyond the fact that being “bored” to me is not a good reason. It’s like saying I’m not being “fed.” You don’t go to Mass for the Community, you go for the Sacrifice of our Lord!
So here’s ma answer to your question: NO. You can not actually remove yourself as a member from the Parish in which you belong. Parishes for the most part are territorial, meaning that everyone that lives in a certain area belongs to the parish. You can call the Diocesan Offices and see what territory you belong to. Many Parishes have registration but this is more for administrative matters. Canonically, you belong to a certain parish. The only way to belong to a different territorial Parish is to move. Really, there is no membership for a certain Parish.
Let me give you an example. When I was asked by the Vocations Director for the diocese “What Parish do you belong to?” I said “I belong to xxxxx Parish, but I go to yyyyy Parish.” Make sense? Now, it is up to the Pastor of the other Parish whether you will be permitted to take part in any liturgical ministries.
Churches are not territorial anymore. You may belong to one miles away from the closest one. And our situation is very much like the poster. Our parish is very liberal and big on “social teachings” and lax on doctrinal things. I’ve never heard an anti-abortion homily for instances (except from our Deacon)and I feel my soul isn’t fed.
The other parish on the other hand has a TLM Mass each Sunday (neither of our priests are interested in even learning the Latin and seem to scorn this type of Mass. Also, I like the pastor, and old fashioned Polish Priest who’s not afraid to talk of sin.
Right now we are torn between the two, but I have a feeling the second one may win.
Hope this helps.
Pax!