To the OP, what follows is meant to be constructive, not to rip you.
The expiration date on "I've always been a bad speller" is fast approaching, if it hasn't already passed. Unless you are dyslexic or have an LD or other impairment (and if I missed that in the thread, please forgive me), there's nothing to stop you lmproving your spelling, grammar and overall writing skills except lack of effort. If you can learn to play bass better, you can learn to write better. Lose your excuses now, because they are liabilitiesworse than worthlesswhen you're an adult.
No one's asking you to be the next Hemingway (that guy had so many demons, you don't WANT to be the next Hemingway). But good writing still matters in the big world. How do I know?
For one thing, my wife has worked in Human Resources for more than 20 years. Numerous times, she's told me how she's rejected job applicants because of poor writing skills. We're talking college-educated people here. If it's between you and another guy for a job (remember, they're scarce), don't you want to have every advantage?
You're 17. That's awesome; you have SO many opportunities ahead of you, including lots that you don't even know about yet. I wish you success in whatever you do.
PS: Re Wobble Man's remark about "internet guidance counselors," many if not all of the participants in this thread are wise (really) adults whose remarks are based on their first-hand knowledge and experience. Some are, have been, or will be parents of 17-y.o. sons at a similar crossroads. Some of us have been that young man. There may be some ball-busting going on, but I don't believe for a moment that anyone participating in this discussion wants to see the OP piss away his time or money. TB is a brotherhood that way.
PPS: +1 to Bongo 5 or Brubaker Brute