Workaholic & Relationships. Advice please

The Lioness🦁
Hi ladies, 
I am 19 and I'm studying at university in England and I want to apply for all these amazing opportunities. I want to spend my summer in America and maybe study a year abroad in America in a couple of years time. I know I'm a workaholic, I love it, I'll always find something to put all my effort into. 
I've been in a long distance relationship for 2 years now and we get to see each other at least once a month for a couple of days but we're in constant contact giving each other little updates on everything. 
My mum thinks I'm being slightly selfish spending time in another country and expecting my boyfriend to be fine with it. I can see where she's coming from and I know he would prefer me not to go so we can spend the summer together but this means so much to me and I really want to take this opportunity. 
When speaking to him about it he says he's okay with it but I know he's dealing with it because he knows how much I want to do it. 
Hopefully as we get older and after we graduate we can spend more time together so it will be easier but I feel like I will always be chasing a dream as that's my nature. I want to share that with him also. But I don't want to feel like anyone's holding me back. 
Surely some of you ladies are also workaholics and are in relationships. Any advice?
Sorry for a long one. 
Thanks x