I'm a noob, but is it possible for everyone to make a profit, or must there always be losers?
Not everyone did best and that is why others will fail. The real thing that may happen in crypto trading is that someone will suffer losses while the others will win. If we feel that we are not happy with the results, think also the reason that causes such negatives and you'll find the solution that could help to fix it otherwise, you'll still be a loser until the end.
The problem with me is that I start feeling guilty thinking that my gain was somebody else's painful loss.
Unless you scammed someone then you should not feel sorry or guilty about your profits, if you are going to use that kind of thinking then you should feel guilty about every single dollar that you get, after all if you work hard at your job and your boss pays you then he is losing money in order to pay you and yet you do not feel guilty about being paid for your job don't you? This is the same, if you do a good job in the markets then you are going to get paid but if you don't then you are the one that needs to pay the market.
Funny, I was thinking about this today. What I feel guilty, I guess you can say sorry for people who are new to this, don't know much and innocently lose their money. Or people who had no idea of crypto being told by a friend or family member to invest in this, they trusted them and then lose it all. Like I feel really bad for such people, and the regret that they must feel.