Greetings,
Your question is more related to poor posture and poor dietary pattern. Considering your age you can push yourself to do exercise which can help you achieve your goals.
Next Steps
if you can hire a person trainer it can help you. do not worry about
thyroid or any other organ. hormone issues can be corrected by diet alone. if you cannot find correct people to assist you let me will assist you. if you need any further clarification do not hesitate to contact me.
Health Tips
remember do not expect results after a month or so. you need to first cultivate good diet and exercise as a habit and after which you can see results. 3-4 months time is needed to achieve some significant results.