Nothing wrong with liking male associated things, doesn't make you a man in any way. Truesay masculine things are more fun
We have martial arts instead of gandu fairy princesses. In Islam it is a major sin to act like the opposite gender but what you're describing is nothing like that. Male clothes are modest, whereas female clothes these days tend not to be and that speaks volumes about your character it shows that you have an innate sense of modesty.
I don't agree with anything LGBT right but Islam doesn't say you have to be straight. If you were born a certain way then that's your fitna and as long as you don't act on those urges - whatever they may be - you will be rewarded inshallah.
The one thing that's concerning is the name change. Like you said it's a sin to act like the opposite gender, and choosing male names falls outside of what I just talked about. It's your choice at the end of the day and I accept it, but I'm not going to put sin on myself by advocating it you get it so ima stick to bachi
No one here was going to say it so I had to be the one, but everything else is fine and normal I got cousins who like masculine things and that's just made us closer.
In today's society everyone feels like they have to fit in a box or be something. That's natural because we as humans need purpose, but when people start labelling themselves things that don't make sense we come out of what is natural. From what I can see you're not doing that at all but just be careful ahlie.
Also, people these days like to say if you're not comfortable with something then that's fine and reh teh teh but if you're having to hide yourself from your own mother, Islamically, there is an issue and you should tell her. Not the name change ting tho discuss that with a counsellor or something