my innate understanding of feminism (which may not align perfectly with the dictionary definition as dictionary definitions are not absolute and the meanings associated with words can sometimes be very dynamic) is that it tries to deal with issues relating to femininity.
you've probably heard about the 'patriarchy' and yeah i actually think that some of the issues involved in feminism are to do with deconstructing the idea of 'masculinity' rather than gender vs gender.
the difference here is very important and i can illustrate this in two examples which shows how men and women can both benefit from the feminist campaign.
women are often seen as 'not masculine' i.e. they are weak, emotional, obsessed with fashion etc etc which can lead to intrinsic biases and therefore discrimination in situations like the workplace
men, however, are meant to be seen as 'masculine' which means they are supposed to be unemotional, strong, violent etc etc which can lead to men having longer jail sentences and less emotional support (despite having higher suicide rates than women)
in other words, feminism isn't PRO females, it's most likely ANTI-masculinity as this is a concept that affects many
there has also been this issue of 'white feminism' where certain people tend to only campaign for issues that really only affect the top percentile of women (i.e. those that are unaffected by race, gender, poverty, sexuality, disability - in other words 'privileged')
however, if you look up 'intersectional feminism' then you'll realise that there are many people are aware of this problem and are trying to have a voice but quite often it takes someone who HAS privilege to use their privilege to make people listen
an example of white feminism is someone who would say 'caitlyn jenner is NOT a women because REAL women have had to struggle with issues like menstrual cycles and low pay etc etc'
whereas, when you think of it, transgender women (and men) are typically more likely to experience abuse and discrimination than, for example, a white woman who is not continuously discriminated against for any other reason other than being born a woman.
so if i use the above as a definition of feminism then YES i AM a feminist
and i suggest those who purely perceive the idea of feminism to be anti-men and a campaign of hatred to maybe not be put off by a dictionary definition and dig deeper into the less-media-portrayed understanding of feminist issues