I used to cry a lot more easily, and have a lot more difficulty controlling it. It was rare that I made it through a single day without bawling about something or other.
Then, I started on testosterone as part of gender transition from female to male. My tears dried right up. For several years, I couldn't cry if I wanted to. My eyes just wouldn't make tears, no matter how sad/angry/frustrated I might feel. Only in the last couple of years can I cry even a little. So, part of the reason that "boys don't cry" is that their bodies don't always let them.
The point is that tearfulness is partially a biological issue. Hormones really are mind altering drugs, and if your body's recipe is interfering with your capacity to function in some way, that is a legitimate reason to seek medical intervention. I can't recommend testosterone as a first line therapy... it comes with a lot of side effects, such as masculinization, which may be undesirable to some. But there are likely other pharmacological interventions that could assist in reducing emotional lability, or at least the uncontrolled expression thereof.