2010 gt manual

Okay I've read and read everywhere but I have not gotten
any answers. Well my car has been acting funny trans
wise. Every so often I'll put into reverse to back and this
last time I did the reverse lights stayed on when I was in
1st and leaving( continues to 5th). I was going to pull the
fuse to turn them off but I realized that the car was being
sluggish. As in like no pick up at all I can do 80 mph but
you don't feel the normal pull like I should. Car won't spin
tires or anything. Please help in anyway. If you have
multiple ideas please start cheapest to most expensive.