This is a bit of a "grey area"
If you had signed up for active duty (full time Army) then under current Army policy you could simply refuse to go to bootcamp and they would separate you with an "entry level separation
" (ELS). This is a "neutral" characterization that is not as bad as an "other than honorable" conditions discharge
But that policy only applies to the regular army. It does not apply to the reserves.
So if you do not go to bootcamp, technically the local commander (the one you are to report to after bootcamp is complete) could process you for an OTH discharge.
This requires they give you notice in writing and a chance to have a hearing (to determine if an OTH is appropriate in your case)...so even though they can issue an OTH often they do not go to the trouble and simply award an ELS.
So if you do not go to bootcamp, you take a risk they run you for an OTH.
What can you do?
You can request, to your commander, that they release you from your contract. You would do this in writing. They may grant your request and separate you
If they do not (or if they do nothing), then you run a risk of an OTH discharge if you do not go to bootcamp.
Still if the goal is to avoid the service, you can refuse to go to bootcamp...just understand that could result in a poor discharge