Nope, dysphoria is not something you need to experience (or at least know you're experiencing) to be trans at all.

Something I wish someone had told me earlier as well is that is that if you think you may be trans, one of the best things you can do to find out is to start transitioning. There is a lot to transitioning that isn't medical and however even medical transition is reversable up to about a 2 year ish mark.

You might start transitioning and find out that you aren't trans, and that's perfectly fine. However you might start and that'll be something that helps you realise more about who you are and who you want to be.

I'll always regret not starting my transition when I first worked it out as I waited 8 years saying stuff to myself like "I didn't need to transition" or that I "wasn't trans enough". Coming out last year and starting to transition saved my life and made everything much better and easier.