Always remember that exercising and eating healthy is a lifestyle journey. You will have great days and even weeks and other times they may be bad days or even weeks, but remember you are stronger than your bad days. Always pick yourself up and start fresh. No one has put a time limit on how fast or slow you should take this journey. You are doing this for you, so you can live longer, so you can be there for your children, grandchildren but most importantly yourself. Once your body gets used to eating healthier and exercising you will feel great. Once you change the way you think about what you are eating (not that you have to eat healthy 364 days a year) you will be amazed at the changes you will make in your life.
If you start out walking, that is great, it is a start. As your body gets use to walking, pick up the pace and walk faster, then begin to jog/walk, even it is is slow. You will gradually begin to get faster.
Never let anyone hold you back or keep you from reaching your goals. This is an amazing journey with a lot of life lessons. You will learn that you like doing things that you never tried or that you did not like to do and also eat. You can do this. Take it one day at a time. Have you set some goals to reach? Let me be more specific have you set some realistic goals to reach? How do you plan to reach them?
There will be many days on this journey where you will have to choose a path, which one will you take? The one that will take you back to the beginning or the one that keeps you moving forward. The choice is yours, chose wisely.