Sharp pain in chest/below it: possibly heart related?

I posted in another group about this, and was recommended to post it here too.

I’m in my early 20s. Around last summer I started having a feeling of fullness right under my chest, and sometimes it almost felt like fat being pinched. Last spring/summer I started doing an exercise weekly, and I’m wondering if that started a feeling of fullness. I’ve also been constipated for several years, and am going but feel like I’m not getting everything out. I’ve wondered if I have something in the way like a blockage because sometimes I feel like I need to go more but can’t.

Around September or October last year, I started having what felt like chest pain, and it would radiate to my back at times. I was also really stressed around this time. Either in October, or a later month last year, I started feeling like I had a sharp pain either in my chest or right below it, and it was bad for several days. I think I should’ve gone somewhere to get it looked at, but I didn’t. I started thinking I was better and trying to ignore how I felt, and I didn’t really notice the pain, but I think inside I felt like something was still wrong.

Yesterday morning I was exercising, and after getting home I started having a feeling of sharp pain either in my chest or below my chest somewhere. I didn’t have the pain while working out. I feel like the pain comes and goes, like sometimes I feel okay but other times feel the pain again.

I feel like something’s wrong though, and at times have had a gut feeling like something isn’t right. I had X-rays done this week, and I’ve been hoping that would show something if there is a problem. I also have a doctor’s appointment this month, but it’s until later this month.

Could this be heart related?