Is this really possible?

I am struggling getting my runs in. It is easier for me to call the YMCA and take Caden and then I do a workout. I have a hard time getting motivated to run on the treadmill. This week it was a mish mash of workouts and runs. I did a 2 mile interval run on the treadmill that felt tough, but good. This morning, I weighed in at 151.8 and felt better running than I have so far. I ran 3 miles in 31 minutes. This is a long way from a 3:40 marathon. There is a part of me that wants to give up now and just ease my way into the marathon in September.
BUT- 99% wants to work my butt off and see where it gets me. I know I can do this training. As long as I keep the other areas of my life in balance, then this training will serve me positively.

I have 18 weeks. Let's do this!!!