I like my significant other but I feel like I can't do it anymore
What do you plan to do here?
I don't plan to do anything except stay with them.
If you think you don't want to keep the relationship it is best to end it sooner. If you wait to end it you could end up hurting people more.
You're right. I'm going to tell them how I feel.
It's for the best. Make sure to explain why you don't want to be with them.