There are three sorts of people today. Some who got good "A" level results. Some who got bad "A" level results. Some who did not take "A" levels. I shall comment in reverse order:
If you did not take "A" levels, then that is fine. They are not for everyone. It does not make you less of a person. They are only suitable for people with a certain sub-set of skills, and with certain ambitions. You have other strengths and aspirations. You have chosen another path, and excel at things many "A" level students cannot do. There is no hierarchy of whether you are a valuable person or not. And that is just fine.
If you took "A" levels, and you are disappointed by your results, then I am sorry. But remember this - "A" levels are not a measure of your person, they are an academic measurement only. Not getting the results you want might change your plans right now, or send you to a different university. Once you are at university, your grades are irrelevant. In life, they are pretty irrelevant. So don't think your life is ruined, or shaped by this.
If you got the results you wanted, then well done. I hope they will make you take the next step in your life. But remember, they are a snapshot of the work you have done. The real measurement of you as a person comes in how you proceed, and how you develop as you take the opportunities before you. You are privileged. Never forget it, and never despise the less privileged.
I hope all can take heart today. Share this so that your friends, and their friends, and their children, know their worth.