Ultimately you are the person best placed to judge your situation (although bear in mind that depression, for instance, creates a bias towards negativity).
The key question is whether you have a settled desire to end your life.
Some people in your situation adapt to their situation. If you do, good for you. If not, it is your decision whether to end your life. You should make sure it is based on a rational assessment of the situation, including getting a prognosis from both a neurologist and a mental health professional, but it is your decision to make and you decide whether a reason is a good one.