Is it normal to be nervous about proposing if I've been rejected once long ago?

My girlfriend of 2 years (she's 25 and I'm 28) and I feel ready to form a family. We're on the same page on various areas. I believe this is the right timing and even though we've already had the discussion about kids and wanting to settle down, I'm still nervous about proposing.

Background to why I'm nervous:

I was with that past girlfriend since we were 17 year-olds in HS. When I was 22, it was my first time ever asking a girl the question and she declined it. We broke up shortly but she wanted to keep me as a friend, a further insult. Even though it's been 6 years later, it's something that can still sting even today.

Is it normal to be nervous? I imagine having the courage once again (to propose) but then get reminded again of that past rejection.

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1 y
That flashback of that time keeps me from doing it again.
Updates
1 y
I never told my current girlfriend of that past relationship, of that past declined proposal.
Is it normal to be nervous about proposing if I've been rejected once long ago?
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