OK, this is a really brutal opinion that is completely uninformed about youand your personal situation.
If you don't have a natural aptitude for drawing, if you don't 'intuitively' know that certain arrangement of objects are more pleasing to the eye (do you spontaneously rearrange place settings at tables, furniture, pictures on walls?), if your childhood wasn't filled with a compulsive need to draw or paint or sculpt, if you have no background in art, if you have never cut a magazine apart in order to rearange the advertisements so that they 'work' better... give it up.
Graphic design is an art form, not a technical skill. Yes, you can take a 2 year course in design, and learn the rules. But the courses cannot teach the "eye" for design. It's NOT like programming, where the logical process leads to a 'best' solution. Many of my clients are graphic designers, and teachers in design schools. They will tell me privately that 1/4 to 1/2 of their students will never have a career in design because although they passed all of the course requirements, they just don't have 'it' - the visual sensibility and creativity to make a compelling communication concept out of their imagination. Schools are cranking out 'designers' by the 1000's. Many of them will starve - because the choices are freelancing (which you don't eat until you pound the pavement and sell your services to clients) or working as a worker bee in an agency or newspaper for $12 - 16 an hour. A minority of them will be good enough to eventually make a name for themselves as a senior graphic designer.
I know, I have had the computer skills for 17 years, I can make Photoshop sing and dance, I teach the programs, and I would never, never describe myself as a designer. I am a technician, not an artist.
If you have the visual flair, the aptitude and a burning desire to create, if you are willing to get the education, build a portfolio of work, and promote your services to potential clients and employers relentlessly to get work, work well under high responsibility and short deadlines, with often unreasonable customers, have an ego that's big enough to know you can do it, and humble enough to accept that 80% of your best ideas are going to get rejected, can survive 18 hour days then weeks at a time with no income, then graphic design can be very rewarding.