I have totally been in your place (with extra weight). I am still 8lbs heavier than I was when I was ready to deliver my son (5 yrs ago) and 39 heavier than after I had him. I have spent the last 8 yrs (I guess I got lazy after I had my daughter) with my weight mostly going on, with small intervals of losing then gaining BIG.
I was tired all the time too. I used that as an excuse. I figured, I work all day, I have to the kids....all I wanted to do was pass out at night.
In June, I made a choice to change. I eat a lot healthier--I still have my off days and snack some times though--drink lots of water, and try to exercise at least 4 days a week. Jobwise, I am pretty active during the day. I started by playing Just Dance 2 with my daughter on Wii. We were having somuch fun that an hr passed by, I was sweating like crazy, and I didn'r even realize it. I did that 4-5x a week for over a month. Then I started to incorporate other exercises. I really did enjoy working out back in the day, I just forgot I did. It's like being retrained.
Find something that works. But take it in small steps. I love kick boxing and dancing. I love to use weighs and the feeling the next day of being sore bc I know I earned that. You can do it