I think I understand my feelings most of the time

I thought I did too but just had trouble communicating them. It turned out that I had overestimated my comprehension. Practice has helped me a lot.

but I do have difficulty controlling them.

Something that I’d caution is that framing altogether. Emotion is part of our experience as humans and an integral part of our consciousness. Controlling our emotions (with exception of those with conditions like Bipolar PD that need help with emotional stability) is not the best goal. Emotions are important, involuntary, and frequently serve evolutionary purposes.

The more healthy way to look at it is addressing how we react when we experience our emotions. That is something that we do have control over. Those of us with ADHD often have trouble with emotional dysregulation (kind of a misnomer, IMO, as it is more about managing reaction to experienced emotions), which makes it more of a challenge. It is still possible though with practice (and accepting that failure is part of the process).

Thanks for the very comprehensive answer internet stranger, I appreciate it.

You’re very welcome. If I’ve helped yourself or anyone else in the slightest, I am delighted.