Low testosterone and obese, fatigue issu

About me 24 years old, weight 86 kg, Height is 5 9. Bmi 28 Doctor since last a year or so always felt tired, sleep issues, mood swings and always felt drowsy. Also i go to gym but have hard time loosing weight and body pains a lot Then it got worse i started having difficulty in concentration and used to have brain fog, it was really bad after eating food or if night sleep was less. So really had issues in studying... struggling a lot, only solution i found that helps in clear thinking is naps or bath. Trying to find the issue since long, finally found my testosterone levels are really low 335 for my age and the symptoms of kow testosterone are exactly similar that i face. Also i have a lot of fat in chest due to this issue i think. Kindly please help