Given up? After 4 months? LOL. Those little seedlings are going to look pretty much just like that for the first year or so, not much to be done with them, except maybe pot individually next spring. Yes, they look like they're probably Pinus spp. You won't have much to work with in terms of bonsai material for the first few years, just maybe a bit of pruning to get the growth shape, but that's it. Maybe 5 years in or so, you'll be able to start wiring and shaping in earnest.