Nobody Listens

Have you ever felt like nobody hears what you are saying?
I am sure that everyone has felt like this at some point or another in their lives.
But have you felt like this all the time? I always have, my whole life. I feel just ignored and kicked aside. Useless in others' eyes.
My parents did it to me while I was growing up; my ex husband did it for the whole decade-plus that we were together; my boyfriend, kids and co workers do it to me now. No matter what the situation, if I feel like I have an idea, or something to offer to the situation, I speak up.
Invariably, whomever I am talking to will immediately dismiss me, tell me how there is "no way" my idea would work, and then continue to struggle without giving it a try. And more times than not, the person will eventually try my idea (not even aware that I had thought of it), see that it worked, and make a huge deal about how they thought of it!!
Are you kidding me right now?
I don't know if my grasp of the English language is just that bad, that I don't get my point across...
Or people these days are just so busy thinking about what they will say next that they don't even hear my input and immediately shoot it down...
Or if there is just something about me that just voids any respectability that my ideas may hold.
By no means do I consider myself a genius, but I did score a 97 on the ASVAB (military entrance exam). Just to clue you in, in order to go to Nuke School, the average ASVAB score is only an 80+. So, I'm not dumb, either.
So why do people just dismiss me no matter what? It frustrates me when I am treated like that, and then I just stop wanting anything to do with the project. I become stubborn and refuse to help. Often times, I now just step back and let the person struggle. Why try to help someone that has shown time and again that my suggestions mean nothing to them?
I don't know why exactly I wrote this post. Just to vent my frustration, I guess, as much good as it will do me!
What is it about a person (my boyfriend, for instance) that people will listen to him, but not to me? If I do not have a valid idea, I am not going to waste my time telling you about what I think.
But... these days, I think I'm done telling people what I think anyways. What is the point? Besides, it's entertaining to watch them struggle....