The weight used on these machines (likely hammer strength machines) are not the same as you can lift on a free weight movement. While it is decent weight it is far from being equivalent to the real thing as far as poundage goes. I actually stopped using the decline variation (well I only did it once) because I couldn't fit enough plates on... I actually had to add weight on the handles. Did 5 plates per side plus 25lbs on each handle. Which would be 500lbs in weight. I do not count the weight of the machine because it is insignifiant. 500 was fairly easy for 6 reps. And at the moment my bench press is not strong because of a shoulder issue. I doubt that I can lift more than 365 on the regular bench at the moment (my lifetime best is 445 on a barbell).
What I'm getting at is that you cannot determine strength based only on these machines. I trained alone for years and always did the regular bench press. The "no partner no free weight" is a weak and dumb excuse. Go to a large commercial gym and you will see plenty of guys doing free weights alone.
With those numbers I would predict something like a 195 - 205lbs x 5 real bench press. Which would be decent for your size, but nothing to write home about.
As for not being ripped... hard to say without seeing you. But my gut answer is that you just don't have enough muscle and carry too much far. 155lbs on 5'7" is small, especially if you are not super lean (and if you were super lean you would look ripped so you likely aren't). Lifting weights will build muscle, but being stronger doesn't linearly correlate with more muscle size.
At 5'7" a decent amount of muscle would leave you at at least 170l-175lbs and lean enough to see abdominals. So you likely need to gain 20-25lbs of muscle and lose some fat to have the look your strive for.
It sucks to hear but sugar coating it wont do anything to help you.