Your quality of life depends on the number of tasks you can take up that you are fearful of.
The breakthrough you are searching for in life may most probably waiting for you on the other side of the work that you are avoiding for long time.
You might be postponing the tasks that are beneficial for you just because they are unfamiliar to you. Any new endeavor brings a bit of risk and uncertainty along with it. As humans we choose safety and certainty over risk and uncertainty , hence our brains resist any kind of change even though it is good for us.
So first show up, start with small steps, familiarize the new stuff to your brain and body, keep doing consistently, get back on track if you fail and do not give up in between.
*Do read the Disclaimer