i was told recently by a rov (when i was going throgh regreting process… )
what ever done in life can always be made into a good thing, even the worse of things like if whatever u did will make u into a better person then it kind of changes it (not that we can erase so teshuva is needed) and ffrom personal experience i surely became a better person.. if u think to urself i did wrong but that was a mistake but from today things are diff that will automatically change ur feeling. just think i am now becoming a stroger person… and u will!! good luck with everything!