Hi! Welcome here!
When I began working out and got discouraged and felt like quitting, I would just say to myself, "What's the alternative"? (I had been overweight all my life and was beginning to experience real health problems that were not going to go away.)
Just keep on doing what you can do, a little everyday. Don't do more than you are ready to do, that is a recipe for setbacks. Just do what you can do at your current fitness level, but stay challenged (i.e. don't go too EASY, either!
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Just know that no one just woke up one morning and was fit and healthy and didn't have to work at it. We all have to work at it. But it is a great journey! You should find tons of motivation here.
Good luck! I know you can do it!
Kathy