I rode my full downhill bike everywhere for awhile, and they are really heavy. no problem at all just got an extra workout to go the same distance. most annoying thing was leaving a $4k bike outside a store or something, even with a lock, cause it will get stolen. so I guess a bit of a pain in the butt. a regular mountain bike is much easier to pedal than that, and I wouldn't feel too worried leaving it around. no problem at all.
but anyways @op that schwinn looks nice. like perfect entry level. I would get better pedals, and kill those reflectors and the kickstand asap. Get a new tube (and some spares and a patch kit and wd40/or chain oil if you dont have it), you can get these doublethick tubes which are sick cause they almost never puncture and you can ride them at lower pressures (added bonus if u care about that sort of thing).
If you ever want to upgrade the bike I would consider higher quality front suspension possibly with more travel. Lock-on grips (always good, and almost a must if you do a lot of tricks/hard stuff). A nice seat and bash guard is optional (most replace the third sprocket on the front, so less gears.. but the big sprocket isn't super useful anyway. it stops your pants getting caught + more clearance/guards remaining 2 sprockets from rocks). Hydraulic disc brakes are also really nice if you want to spend money, but idk if its worth it for that bike. I really enjoy them though, great stopping power. Mechanical disc brakes like the front of your bike (appears to) have are outclassed in every way by hydraulic disc brakes except price. Mechanical = pleb disc brakes. V-type brakes (like the rear) while being the cheapest of the three, at least have some redeeming qualities that I can get behind. They weigh less. anyways just some thoughts on what I would do, maybe you care for it maybe you don't :)