I tried using tampons a few times because that's what my friends who were girls used but it felt so uncomfortable even before I came out as trans or even accepted it myself. I mostly used pads for the longest time, but now I just use toilet paper. I stopped with the pads because 1) they get gross fast especially in gym class, and 2) I would always get dysphoric when I would look down and see a bloody pad. Also just using something that is made for females made me feel awful. So now I just roll up a good amount of tp just like when you do to wipe and then I make sure it's nice and snug against my body. Now I don't have to see anything bloody because it literally just falls into the toilet when I start to pee, it doesn't move around nearly as much as pads, it's not geared directly toward females, I don't have to touch my parts, it lasts a good 2-4 hours without leaking (unless the flow is particularly heavy), and I don't have to shove it up a hole I shouldn't even have as far as my brain is concerned.