Girls who like girls

OK I’m a lesbian and I have a girlfriend for 13 months it’s a long Distant relationship when she told my sister that she wanted to come see me when I start school here in the spring I’m kind of scared because I never eaten anyone’s pussy before and she’s the first person who’s actually sticking looking for a long-term relationship I mean she knows I haven’t done anything with any female but to me I keep thinking about what if she just wasted all this time and she don’t think I’m good and I suck because Never eaten anyone out.... Any advice