My teacher (whom I converted to Linux) noticed significant speed-ups in LibreOffice launch when he switched his laptop to Ubuntu.
Windows took about a minute to load LO, while Ubuntu took only a few seconds.
Check out this beautiful-looking distro: https://www.jingos.com
The site says that JingOS will be available starting January 31st.
Read Jason Evanghelo's article on JingOS here: https://www.forbes.com/sites/jasonevangelho/2021/01/18/this-new-linux-os-sure-looks-like-it-was-designed-by-apple/
Worth it? Absolutely. Windows 7 (despite being my favorite version of Windows due to the stellar UI) is no longer receiving security updates. This likely won't affect you; however, it does mean that you are more susceptible to ransomware and the like.
As far as your laptop specs, Linux can take...
Did you just copy the ISO to the USB drive or did you burn it to the drive?
In order to better help you, it would be nice to have some extra info, such as computer make and model, what app you used to create your bootable drive, etc. etc.