Is this normal?

Brittney • Brittney, 20, Aries. Mylifeasbrittney.com. ❤️
So, I'm a female living with Cerebral Palsy. I didn't really have much sexual contact besides my current long term boyfriend. But there hasn't been any penetration. I experience a burning feeling even with just his fingers and I'm not sure why or what to do, it's really painful and obviously I want to be intimate. But I'm scared because of this pain - what can I do to get past this?
 I also think fear of sex itself is very much a thing in my mind given the household I grew up in where it was associated with pain and you couldn't talk about it. Help. What can I do?
I've also been thinking of getting a toy & some lube to work on this. I currently have just  a vibrater.