As one other on here has already said, you should not be afraid to change instructors if you feel you could do better than your current one. I've had several different instructors on the same course at various stages of my flying career. Whilst doing my PPL I realised that at £125 an hour I should be able to 'hire and fire' my instructors if I was not happy with their performance. I have had bad instructors and good instructors over the years and this made me realise they are not all the same.
If you were taking driving lessons and you weren't happy with your instructor you wouldn't hesistate to change, would you?
Re- the gliding previously mentioned, I started out in gliders and I've never been happier in powered aircraft than I was back in a glider. The only reason I didn't stick with it was the 'golf-club' mentality and the need to have the cooperation of at least five others to get yourself airborn. It was amazing though, to fly a vintage glider solo in formation with a buzzard is a memory that will never leave me.
It gets really fun when you first solo. My first solo in a glider had me singining Bohemian Rhapsody at the to of my voice all the way round. It remains the single most happy and exhilerating moment in my life.
"BISH ME LAA NOO, YOU WOULD NOT LET ME GOOOO......."