Welcome to HCM
We understand your concerns
I went through your details. I suggest you not to worry. Nothing happened. That is it. Everything is imagination, is in your mind. You are thinking about your genetal area too much. Forget it. You must concentrate in your studies or career as of now. Erection is possible when you are sexually aroused. Why you want to force erection? Forcing erection will do no good. Masturbate only twice or thrice in a week. Never more than that. Because if you cross this limit, you may have sex performance anxiety
. You can contact me for sexology related queries.
Hope this answers your query. Available for further clarifications.