A college degree is extremely important if you want to get decent employment. Employers view it as a strong indicator of many of the qualities they look for - general educational level, intelligence, ability to work hard, willingness to function in an institutional environment and so on. In general, they are right - people with college degrees have much higher lifetime earnings, on average, than people without. There are exceptions of course, just as not all 18 year old males are high motor insurance risks, and some 50 year old women are. But in general, that is not the way to bet.
Now for some fields, such as trading by yourself, or being a professional golfer, or working in a mine, it is totally irrelevant. If you plan on *only* working in those fields, then you will not suffer from having no degree. The problem is that now you want to go into the conventional employment world. Well, without a degree, why would anyone take you over someone with a degree from a good university? Given the competitiveness of job applications in the industry, and the difficulty of distinguishing people just by a CV, other things being equal, the guy with the top degree from a top college will get the interview and you won't.
This is a fact of life which you knew when you chose to drop out. Remember that self-employment is risky, insecure, and ultra-competitive in the trading field. IMO you need to make a choice now, realising that this will probably be a choice for life. Either you are going to be consistent with dropping out, and make it yourself no matter what. In that case, realise that the consequences of failure will be greater difficulty in getting any kind of decent job later on if you fail to make it alone. Or, you are going to give up on making it alone, and try to get employment in the trading field. In this case, recognize you made a mistake dropping out, go back to college asap while you are still young, complete that degree, and then go into the job market. You could actually spin that to your advantage - it is rare for a college dropout to go back and complete their degree, and it shows maturity and strength of character.
As for the "screw the degree" posts here - that's fine ONLY IF you can be self-sufficient your entire life. The moment you ever want to interview for a job, you will feel that disadvantage. Right now you might be able to complete a degree with only another year or two of studies. Leave it longer and it will take 3-4 years again. Once you have that degree, you never need to do a day's studying again - it will be permanently on your record and you will carry it for life. That's a pretty appealing proposition IMO.