I just picked up a used but nearly unridden '07 Specialized Hardrock Sport (non-disc) wanting to try out MTB after years on road bikes. Spent $150

I have a small budget and this was the best deal to come up on CL, especially compared to all the other crap I've seen available.

I just can't seem to get over the fact the bike feels so heavy! I know it's bottom level, but better than some. Coming from road bikes MTB feel heavy so I have no real comparison.

Is this frame worth building on over time with better components? Or is it really a boat anchor?

Should I consider selling it, try to make some money on it and just look around for another, higher level bike? Obviously I'm starting on easy offroading and trails, no big air or downhill kamikazi runs for me.