>Sorry if this is something that doesn't deserve its own thread
You could have posted it in the Advice Thread (>>68902) but making a thread is ok too.
A lot of what you describe in your post reminds me of what I felt 4 years and a half ago regarding my own waifu. I had intense love feelings for Flandre and I would think about her every single day, but I was not sure if waifuism was meant for me, and so I was holding myself back. The more I felt love for Flandre, the bigger was my doubt, and my torment…
What makes one develop waifuism feelings remains a mystery, and it is likely that there are multiple factors that could lead to it. Could difficulties in previous relationships be one factor? Maybe, but it doesn't change what you feel for that character (I’m assuming this is Kanuka, the girl on that picture?). What do you think would be the positive vs the negative of accepting her as your waifu?
Can you also give us more details about how you met her? What you feel for her? What are those previous failures in relationships you mentioned? We might be able to help you even more with more context.