Hang in there mate,
I staryed distance learning under the old CAA system without the benefit of all the feedback there is around now. I gave up and came back to it full time some years later. I regret that decision because although I now have my licence, I'm also pretty ancient. Full time will definitely be easier, but what ever you do, devote yourself to aviation and do it sooner rather than later.
I can help you with any subjects you're finding hard.
Good luck.