Tips on first time masturbating

Okay so whenever I feel horny I would just wait it out or rub my thighs together for stimulation. I’ve never really tried clit stimulation or vagina penetration before because I always felt uncomfortable about it. I want to explore my body more and thus decided to finger myself. Key word: tried. I was only able to get like one finger knuckle deep but it was such a weird feeling to me that I couldn’t continue. Is there any tips anyone could recommend for first timers? Specially on first time nerves and attempts to organism?