Long distance relationship

I’ve been dating my boyfriend for a little while. We were friends for years and talked for a while and now we’re dating. Well he’s just now telling me that he’s moving states for school... The program lasts for two years. He said he’ll come visit me, but I don’t know... I really like him but I’m worried miscommunication will ruin things between us. I’m worried we’ll get bored of just texting/calling as he’s not very into texting. I’m worried I won’t be sexually satisfied enough (I’m a very sexual person) as he won’t be around much. I don’t want and won’t be the girl to say “screw your education, stay with me.” But I’m worried that we might ruin what we have. Also someone can change a lot in two years. Especially us being 21. I don’t want to wait on him for two years then him come back and either we don’t feel the same, or the love isnt there and I will have wasted two years. On the other hand, us breaking up... I don’t know if I could do that either. Picturing him with someone else or picturing myself trying to go out with someone new doesn’t sit well with me. Since he’s told me (like 30 mins ago) I can already feel myself distancing myself from him, as it’s my defense from being hurt... he keeps saying not to do that and I’m trying but I feel like I’m just asking to be heartbroken.. I need help ladies. Have you been in a long distance relationship? If so, what worked and what didn’t? Did it work out? (Sorry this is so long, just don’t have anyone to talk to and I’m freaking out)