This is why (and I am learning this too) that it is critical as a man you have multiple outlets to burn your energy and nervousness.
So if she has to bail because of life or her insecurity, she will learn that your desire and attention to her is a gift also.
If she is not able to appreciate it, then offer it and be vulnerable, but then leave it like a note on the table.
Then step back and walk away and go conquer something, or look around for someone who might be noticing your but doesn't have the confidence to reach out.
There are soulmates for people, but there isn't just one. There are thousands of them, but sometimes they are not ready for you yet. So observe, act, and keep peace with yourself and your emotions.