Transfem

Be aware that you are not alone in this. All people have the throat lump. It's part of the speech hardware. Testosterone does cause it to grow larger, but cis women have it too. Cis women with visible adams apples have similar negative feelings about it. The idea that the throat lump is a male only structure, or it's the tell for otherwise passing trans women, is misinformation peddled by transphobes. Also dysphoria has a tendency to hyperfixate on certain body parts. I can assure you, you are far more aware of your throat than anyone else.

But anyway, practical solutions.

Fashion! I know you've posted about your protective scarf. That's a good thing! Concealment is effective. I would also suggest turtlenecks for this. They are a good look that conceals your entire neck. But also they make short sleeved and sleeveless turtlenecks that will still be suitable for summer.

Another strategy is distraction. Instead of hiding the bad parts, draw the eye away from it. If you wear a necklace with a pendant, it will draw attention away from your neck and onto the pendant below. A top with an interesting neckline like a keyhole can work too. Really anything with a visually interesting pattern near but not on the neck will work well for this. People will pay far more attention to that then your neck.

The value of the distraction strategy is that it doesn't draw attention to itself. If you hide your neck it can make people think you have something to hide, which makes them curious. You can do this distraction strategy with posture too. If you carry yourself with the appearance of confidence as if nothing is wrong, people will pay far more attention to that then your neck.

I would also suggest doing voice training if you're not already. Or do it more enthusiastically from now on. A big part of feminizing your voice is changing the resonance to emphasize the higher overtones. Achieving that higher resonance raises the throat lump upward in your neck, which makes it far less viable. And with enough voice work, you can eventually just hold the throat lump consistently up as the default position.

As far as more longterm things, when you gain weight, some fat will be deposited around your neck, which will make the lump less visible. It's not very visible for me, but that's mostly because I've not taken good care of myself for the past few decades. oops. To be clear, I'm not advising you to deliberately gain weight for this, especially if you're not yet on estrogen. But once you are, over time the throat lump will become less visible. Most people do end up gaining weight in their mid 20s. Rest assured it will be less of a problem someday even if you do nothing.

Also if its still a problem, I think is possible to get the lump surgically reduced. I know nothing about the details other than it is a thing. Obviously not something to do anytime soon.

I hope this helps! Take care of yourself! <3 <3 <3