tight knitting makes all decreases hard, (some seem harder than others.)
why do you knit tight?
some knitters are fearful that the stitches will slip off the needle (and pull the yarn tight)
some knitters tend to work on the tips of the needles (with pencils, you use the tips--with knitting needles, you use the shaft (not tapered tips) to make the stitch
some knitter are just using the wrong size needle (to get gauge.) knitting tight on a 'suggested size 6" rather than easier on a size 5..
IF you identifiy your knitting as tight.. well there is one place to start, to resolve the issue.
think about what you do as you knit, think about what you can do to change it.
you might always be a tighter than average knitter, but you can learn to knit with more ease--enough to make decreases easier!
It's your knitting.. and to some degree, it's your problem (or not--it could just be your style!) but if tight knitting is creating problems for you.. ONLY YOU can decide what you need to do to change your knitting and resolve your problem!