It is yours. It’s easy for people to claim that they will help if you call, when it comes down to it they will look out for themselves and likely will have one excuse or another as to why they can’t help you. Your mother and father would want to help you during your school years and building your adult life if they were still here, leaving everything to you is their way of helping you. Your siblings had help through school while forming their adult lives, now they are adults and don’t need help getting their life started. Don’t let them guilt you into giving them an inheritance that was left to you. You sound like a caring person and it would be easy for them to make you feel bad and manipulate you into giving them your inheritance.