Welcome to the forums, newcomer!
What are the specs to your system? Streaming while gaming tends to demand more from the system as opposed to just gaming off the same PC(without additional tasks).
List your specs like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
Chassis:
OS:
For the sake of relevance, include the age of the PSU, the version for your OS and the BIOS. It'd help us two fold if we also learned of the games you're trying to play/stream and where you sourced them from.