It is common nowadays that the media call Muslims with labels such as fundamentalists, extremists and terrorists and many Muslims start apologizing.
Well, actually a different approach is needed.
The meaning of fundamentalist is "someone who follows the basics of something".
Therefore, to be a good English speaker you need to follow the fundamentals (basics) of the English language and someone who follows that is a fundamentalist.
Similarly, being an Islamic fundamentalist means that you are following the basics of Islam and there's no harm in doing that so no need to apologize for being a fundamentalist.
As for extremists, every Muslim should be an extremist.
Islam teaches peace and love so a Muslim should be extremely kind, extremely merciful and so on.
Furthermore, no one should stop you from being such an extremist.
A terrorist is someone for who terrorizes someone.
For example, when a robber sees a policeman, he is terrorized and therefore, the policeman is a terrorist for the robber.
Similarly, a Muslim should also be a terrorist for anyone who does something bad such as stealing.
And if every Muslim is a fundamentalist, extremist and a terrorist, the whole world will become peaceful and very few crimes would be taking place and that is exactly what we want.
Therefore, every Muslim should try their level best to be a fundamentalist, extremist and terrorist to save the whole world from getting drowned by crimes.
Similarly, the media should be note that a Muslim can be called all of these things but only in the positive view.