My two rats are not very interested in me, either. Not very affectionate. They're curious, and not afraid of me most of the time, but are much more interested in the big wide world than in me. I have handled them and bribed them with treats since I got them, when they were about 2 mos. old. My rats do groom each other a lot, and spend time piled on top of each other in their hammock or squeezed into their cardboard box. They love free-ranging around the house, and play-fight with each other. But I haven't been able to train them or even teach them their names. Once in a while they come to me, but they don't cuddle with me. I find the best time to cultivate affection is when they are sleepy in the morning. Scratching their cheeks and heads sends them into blisses of bruxing. They relax and close their eyes and bliss out. If I scratch between their shoulder blades, they will nibble and lick my fingers or hand. If yours sleep a lot, that's the time to cuddle with them and groom them. See if they will sleep near you on the bed. I make my ratties very happy by giving them paper to rip up and shred and pull into their nests. I use plain paper that comes as wrapping for items I order online. I wouldn't use anything with ink on it. They spend a lot of time exploring it and tearing it up. Good boredom cure.