I think we need some more information: What brand? Which size? What strings? Which videos? Is your uke tuned at the right pitch? Is it reentrant (top string high G) or linear (low G)? If you're not sure about the size, then measure the scale length (i.e. strings from nut to saddle): A Tenor has a scale of 17" (43 cm), a Soprano more like 13" (33 cm).
For a more guitar-like tone, use a Tenor (or even a Baritone) sized instrument with linear tuning. You need a different string for linear tuning. Most low G strings are wound, but there are some unwound sets like Worth or Fremont Blackline. Ukuleles are designed for nylon or fluorocarbon strings; you cannot just change to steel strings, as the tension might rip of the bridge or crack the top. If you prefer steel strings, then check out the Pono UL models: they are about the same size as a Baritone Ukulele, but designed for steel strings to be tuned like a Guitar.
Last but not least: Most recordings will sound different from what you hear in person. Not just because some of them are probably better players than yourself (or me, for that matter), but because recording will most likely add a flavor to the sound, depending on what microphones are used, room conditions, distance, background noise, etc.