Rose is spot on again.
It's like the saying from Bhudda: If someone gives you a gift and you refuse to take it, to whom does the gift belong?
If you refuse to "be ignored" by other people, then you just let them have their way and you go on yours.
One thing I see missing though for you is self worth. I see that you are unsure of yourself, or what you have to offer other people. Do you tend to hang around others to gain friends and hope they don't uncover the real you at all?
The next step is building self worth, finding things that are already there in you that are worth something, and uncovering them. If you don't find anything, invent something and build it. Popular people are only so because they have worth. Confident people more so, because they have self worth. All the great charismatic leaders believed in themselves formost, allowing them to believe in other people.
As for caring what others think, you can never know the mind of another, only your own. When you worry about people ignoring you, or what they think of you, *you* are the one thinking about them thinking. It's all in your head. There does exist in reality actions of people and outcomes, but the intepretation and the thoughts about the whole thing are all yours. In fact, people are too busy worrying about what people think of them to actually think of you at all. 95% of the time, those that actively don't care what you think use it as a defense mechanism to protect themselves from any ideas that might unhinge the way they think about themselves. You can never get someone to do respect you, or even stop ignoring you. You can only make yourself a worthy person, and become someone who deserves to be listened to and respected.