I'm very in touch with my emotions. I'm constantly aware of what I'm feeling deep down. On the other hand though, I don't express it readily. I mean, I can whenever I want but that's just it: it's always up to me, it's always a matter of choice. My emotions never just come up on their own, I pick and choose what I want to express outwardly.
Sometimes I indulge in emotional expression, other times I don't. I really love that it's up to me, because I can experience deep feelings every time they arise yet I never screw myself over by making counter-productive emotional outbursts. A 4w3 Sx/Sp ESFP I know is the same way. She is the master of her emotions. Sometimes she surfs their waves, other times she plays Moses and parts the waters.
Obviously, coming from my perspective I believe that the best way to control your emotions is to be in touch with your feelings. That way you can release some of the "steam" here and there as you choose rather than letting it build up. Otherwise, you run the risk of them coming out unexpectedly and/or of them festering and leading to periods of increased stress, sensitivity, or depression.