Feeling hopeless

3 years later still no baby, all the tests, including pretty invasive tests after have 2 sections to check all is well and no reason for it. Iv seen my sister get preg an celebrate her sons first birthday my friend go thru a pregnancy an give birth recently and now my younger sister just found out she’s pregnant and I’m anticipating seeing her birth her baby before I ever see those 2 lines. So get me wrong I’m incredibly happy for them but does anyone else have that sinking feeling 😕