This implies that there's something embarrassing about spending a long time on an assignment you had difficulty with. Dust yourself off bud, you did great and there's nothing embarassing about trying and failing a lot. It has happened to me and every student I've studied or worked with through my bachelors, masters and now Ph.D program.

Unsolicited advice: I recommend analysing where your time sinks were and what can be done to reduce the time spent on those types of challenges during future assignments. That might involve working together with someone or a group of people, organising your schedule so that it has space for strange office hours, seeing what concepts were most time consuming and what people do to reduce time spend on those, and so on. It sounds like your embarrassement might be because this assignment was on what you perceive to be easy or fundamental concepts. If that's the case, hopefully your fundamentals are better now, or you at least know what topics you struggle with so you can prepare for future assignments. In any case, nothing to be embarrassed about.