Hi ladybug29,

This is pretty common. Everybody learns at their own pace. When the you play with a backing track it might be a little more difficult because you have to suddenly keep up with the other instruments. When you're playing alone, you keep your own time and that's a bit easier to do.

It takes a bit of time and practice, but I do suggest trying to play along with the backing track so you can get used to playing a song at full speed. Be prepared to mess up, because there's no avoiding that. But playing at full speed teaches you when to change chords, and teaches you a bit of rhythm as well.

Stick with it, and I am sure you will get it!