It looks like it might be an Epiphone SG EB-0 bass. (Obviously, Epiphone. Hoping I've got the right model). I don't recognise any of the signatures though.
Take a look on Reverb or eBay to see what sort of prices they are going for. Beware that on eBay, the asking price isn't always what they will sell for.
What about selling it and buying a nice gift for the donor, or explain to him that you aren't getting on with it and ask if he would mind you selling it. You could offer him all or some of the money minus any expenses.
It's hard for us to say how well you are doing without hearing you play. You might know all those chords but struggle to put them together. How do you feel you are doing? Do you play along with songs or backing tracks? Have you considered playing with other people?