Can a 23 year old guy get into marketing with no college degree?

I don’t have a college degree.I wasn’t lazy.I just didn’t know what I wanted to do.

I got into programming and web developing but 2 months ago I got a job in a sales and at the same time I am managing the company’s website/facebook accounts etc.

This is the first time I have need to study a bit on digital marketing and it has sparked my interest greatly!

Do you think I could get a job in a marketing agency if I took part in some good quality seminars even though I don’t have a college degree on marketing?

Do you have any other ideas on what I could do to further improve my chances and gain more knowledge,abilities and/or mor qualifications?

Thank you!