I'm not sure that one can entirely, but the key (IMO) to coping is, in a word: distraction

The Most Powerful Pain Reliever Revealed

distraction as a pain reliever

If you're religious/spiritual, you may find some solace in the 'Serenity Prayer'; if not, I believe there is still some value in the underlying lesson/wisdom—worrying/obsessing about things we cannot change/control serves no purpose other than further harm to ourselves. The energy/effort is better spent on things we can change/control/influence, and we'll feel better about that. Life is (too) short and the clock is ticking regardless, with no time-outs/do-overs.

Self-Pity

I never saw a wild thing
sorry for itself.
A small bird will drop frozen dead from a bough
without ever having felt sorry for itself. —D H Lawrence

In my own experiences in coping with chronic illness (pain), knowledge and undestanding of what's going on in our heads/psyches—our shared humanity—has been more helpful to me than all the sympathy/empathy (pity?) and therapy offered.

The two concepts that come to the forefront are the Kübler-Ross model (as adapted/applied to chronic illness) and the Vicious Cycle (of chronic pain/illness, depression, anxiety/stress, insomnia, et al.) There are, of course, many others, from quotes to self-help. Laughter is important, as is keeping a sense of humor.

I can see I'm beginning to ramble a bit, and in peril of straying maudlin.

Doc

Is it possible just to get used to any kind of pain/discomfort? I think it's an issue of degree/necessity, prospect, and choice.

Degree/necessity: How bad is bad? One person may be able to get used to what they judge to be level 5 or 6 pain, while another may have difficulty with what they judge to be level 3 or 4. Some sources say that the goal of pain management is to 1.) reduce the sense of suffering and 2.) improve the quality of life. That's pretty vague, and leaves a lot of room for interpretation. Pain Management doctors evaluate patients according to (among other factors) what effect pain has on their day-to-day lives—are they (patients) able to get enough healthful sleep, are they able to take care of their day-to-day needs (work, school, chores, errands, paying bills, hygeine, etc.), is there excessive preoccupation/obsession with pain, major depression, etc. In short, are they able to function, and how well.

Prospect: Is it harder to get used to discomfort when there is no prospect of relief, or when there is prospect of relief, but one (for whatever reason/s) can/does not avail oneself? This brings us to...

Choice: For whatever reasons, people make choices about whether to seek/accept some kinds of medical help/treatment or to forgo or discontinue them.

Only you can decide how bad these sensations are, and if you can/will be able to just get used to them. Time will help some; life has an indomitable ability to adapt and persevere.

Doc