You aren't allowed to play against yourself on alt accounts - it counts as rating manipulation/cheating.
Chess Elo
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Just stop and tell an admin about it. Maybe you'll be able to keep the account. 
Yeah, you need to message one of the admins like @justbefair and sort it out with them. Otherwise your account might get flagged and autobanned. But as you're new and being honest about it, maybe you'll just get a warning.
Guys I'm so close to 1000 ELO and I just started what is that