I got some cat 5e cable and it is extremely hard to insert the RJ45 jacks. They require too much force. I used to work as a network technician so I’ve made lots and lots of patch cords and never had that problem before. The cable strands would slide in the jack pretty much effortlessly.
So there are two possibilities:
Either:
This cable was meant for patch panels or wall sockets only and not to be fitted with RJ45 jacks. Is there such a cable?
It’s actually Cat6 and 22AWG conductors instead of the 24AWG of Cat5?
It’s stranded Cat5e and the RJ45 connectors are designed for solid conductors (which are slightly smaller diameter than stranded)?
If it’s solid conductor, it’s not suitable for patch cables. You should be using stranded wire for patch cables. Solid wire is too inflexible and prone to cracking over time as it gets flexed.