Have you adjusted your seat height, fore/aft position and tilt? There's usually a nut (6mm allen on many) that you can loosen for the fore/aft & tilt. To raise/lower there might be a quick release or a hex bolt. Maybe you've already done this? If not and you can't afford a fitting, you could do some online research regarding the general "starting point" of how you should be on the bike and go from there.
Welcome, by the way. I don't envy the heat you're having. We're having highs in the 70's next few days so I'll send you some cool.