I think I'm moving on too soon.
What makes you think that you are moving on too soon?
It's only been a few months, but I want to explore life and find someone else.
I understand why you think it might be too soon, but it's okay for you to move on and try new things. You don't have to wait a certain amount of time before living your life.
It's too soon, I think I'll stay in this relationship a while longer.
If you feel that you are ready to move on than go ahead. Everyone feels ready at different paces, so do not think it is too soon if you feel up to it! Having second doubts on your relationship may be a red flag anyway.