Timtruo,
It's only the first week of October!
You still have plenty of good riding weather ahead. Don't give up yet. You have done several long rides to date so there is no reason that you could not repeat those distances on weekends, which will get you closer to your goal in a hurry. There's also still enough daylight to get in an afternoon ride, add some lights to your bike and the day is streched out longer.
You can do and we can help! HTFU and get on the bike, no excuses!