You have already taken the first step in dealing with this problem – you have admitted it both to yourself and to people here. Well done for that – and at only 18. I started gambling at 16 and was in my 30’s before I sought help.
If you can “fix things” without gambling again then, of course, go for it; but don’t be afraid to let those closest to you know what is going on. Don’t be tempted to lie about your losses, that will only cause more problems in the long-term. Speak to a family member or close friend you can trust and get support and keep strong.