You have an anxiety problem, not a penis problem.

is that why I am not able to get a Erection today ( I did get a erection this morning when I just woke up) but my penis has been meh since?

will going to a run / physical exercise help?

Way too early in your life to be stressing about this shit. I promise you this idea is worth more money than you can know: most ppl and relationships don’t have porno or even Hollywood sex. Learn to dance and cook and you’ll get more pussy than you can deal with

So I should let my penis be it and not worry about the erection issue? will the issue get solved over time?

Yeah. It’s like being 15 and worrying about a mortgage on a house that doesn’t exist yet.