Oh no it is life changing if it is what you need. Your levels are very low, anything below the mid 400s is typically where there is a correlation with major medical issue. You talked your doctor into that test because you feel wrong. If you feel off you are off. As to what you can expect from testosterone therapy if it is what you need or if it is all you need.
You will think clearer, sex drive will increase, mood will improve, physical strength will increase. stamina will increase, you will lose weight gain muscle or both. There is more but it depends on what you have lost. And how long you have been low. And the changes take time. Energy and sex drive might come on in the first two months, maybe even sooner. Mostly it all keeps improving for a year or so. And if you are working out the improvements are very noticeable. If you need it once you get it dialed in, it is life changing. But it is not a miracle cure of all things.
You have not given enough information for anyone to tell you much. Your doctor did not test enough to know at all. You are low is all you know. Free testosterone? You have no idea. Estrogen? You do not know. Is it a thyroid problem? You have no idea. You can not possibly treat yourself, nor could any doctor have made a good diagnoses based on what you know.
You need more info.
"Please read the stickies found here:About the T Replacement Category - #2 by KSman
advice for new guys - need more info about you
things that damage your hormones
protocol for injections
finding a TRT doc
Evaluate your overall thyroid function by checking oral body temperatures as per the thyroid basics sticky. Thyroid hormone fT3 is what gets the job done and it regulates mitochondrial activity, the source of ATP which is the universal currency of cellular energy. This is part of the body’s temperature control loop. This can get messed up if you are iodine deficient. In many countries, you need to be using iodized salt. Other countries add iodine to dairy or bread."