I am honestly at a loss at what I am supposed to do in this game. The missions are all impossible for me for some reason and has a shitty payout. Flying around suns grinding marked targets is only fun for 20 minutes. Trading is boring when there is combat. I don't know what to do. All I have been doing the last couple of days is loose money on insurance and repairing my ship.
Therefore the best advice to give to anybody who hasn't at least progressed to a well equipped ship (a well equipped Cobra (~2m credits) as lowest barrier of entry), is to ignore all but a few missions. The only missions worth taking for a start are smuggling missions. Those, that give you the cargo and require you to haul them somewhere. Those offer reasonable payout for the invested time. Provided you've upgraded your FSD appropriately, otherwise you may find you can't even reach the target system for a mission.
Much more convenient, especially in a Viper, is bounty hunting. Go to the system's NAV beacon (near the sun), scan all ships and help system authority kill the wanted ones. Even better is high RES hunting (resource extraction site, in planetary rings that aren't icy ones). Never open fire on a ship before the scan is not complete, even if all other ships are doing so! Otherwise the authorities are going to hunt you down. A single sidewinder kill may give you ~8k credits. Anything bigger - where you might have to rely on the system authorities to do the lion's share of the damage - may get you 10s of thousands of credits. Up to 300k, if it's a FDL in a high RES.
Good hunting!
(I've given this advise so many times, I really hope they sort out the progression path their missions offer at some point. At the moment, they simply don't offer a reasonable path of progression.)