How are you testing the CG? How far back is the suggested CG on the wing?

If the plane is balanced correctly, it will fly. Without any information on what plane you have, I can't give any other advice than what the manufacturer suggests. I sure hope you aren't blaming your crash on me, because that would be silly. Everyone in this thread told you to balance the plane. If the manufacturer gave you a bogus CG point, then that is their fault. I gave the advice I did because it sounded like it would help the conditions you are describing.

Another thing to make sure to check is that your elevator throw is within the recommended range. If you go to take off and pull too much elevator, what you are describing can happen as well, even if the CG was perfect. Is there a club nearby that could help you out with your plane? Having someone there to actually look it over and maybe even fly it would be worth a lot to you.

One thing you could do to kind of make RC a little more exciting is get a better beginner plane. The corsair is usually a fairly advanced plane, and since I don't know the manufacturer of the one you have, I don't really know how advanced it is. Something like a Hobbyzone Supercub is a really good beginner plane and it will get you up in the air for sure. Once you are excited about RC and learned a little more, then you can tackle that corsair and fly the heck out of it.