I wasn't good at C++ either. Actually this one is not very easy :)
Since you know how to do C#, C++ can become easier. The biggest change happened for the C# to C++ is - use of dots '.' Most of the time, there is dot based OOP. But you can also use these two symbols - '->' and '::'. And instead of writting 'using Math;', you use '#include FMath.h'.
Now I am very comfortable with C++ by almost a year :)