Can’t make myself cum

I’m 19, I’ve been masturbating since I was little, and find it really hard to make myself cum. I can reach an orgasm with the help of someone elsethrough sex/foreplay/ or even if it’s just by being told what to do to myself over the phone or FaceTime... but when I’m on my own, just me my fingers (occasionally a toy) and I, for some reason I really struggle to reach an orgasm. I hate this because I’ve been single now for like a year and haven’t been really having sex with anyone or fooling around so I haven’t been able to cum in what feels like forever. Any tips on how to make it happen??? Could I possibly be masturbating too much?? Like sometimes I feel I may just like... feel it coming and stop cuz I can’t take it LOL. I dont know but it’s literally so frustrating.