Figure in Latex is not centering despite using \centering - latex

Question

I am very new to LaTex and am trying to center a figure.
I have tried to use the package float using both [h] and [H], I have tried to add \centering and I have tried to wrap the image in \begin{center} \end{centering} but nothing seems to work.
My full code is as such
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{float}
\graphicspath{ {images/} }
\title{Dissertation}
\author{GC}
\date{\today}
\begin{document}
\maketitle
\section{Introduction}
\begin{figure}[H]
\centering
\includegraphics{my_grades}
\caption{grades plot}
\label{fig:grade}
\end{figure}
This figure does not seem to want to centre
\end{document}
This figure on the compiled document looks as such. If someone could help me understand why this doesn't want to move that would be great:

Answer 1

Your code seems fine, I just added a [width=50mm] in your include graphics and it centered the Figure.
I would check two issues:
Is your figure to larger than the textwidth?
Does your Figure has a white part on its lefthand side?
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{float}
\graphicspath{ {images/} }
\title{Dissertation}
\author{GC}
\date{\today}
\begin{document}
\maketitle
\section{Introduction}
\begin{figure}[H]
\centering
\includegraphics[width=50mm]{darth-vader_5yvm.jpeg}
\caption{grades plot}
\label{fig:grade}
\end{figure}
This figure does not seem to want to centre
\end{document}